Twitter-bootstrap add-on to create dropdowns in button groups (like http://jsfiddle.net/Sherbrow/3R3EV/6/ )

dropdown-btn.css

.dropdown-btn {
    display: inline-block;
    *display: inline;
    /* IE7 inline-block hack */
    *zoom: 1;
    padding: 4px 10px 4px;
    margin-bottom: 0;
    font-size: 13px;
    line-height: 18px;
    *line-height: 20px;
    color: #333333;
    text-align: center;
    text-shadow: 0 1px 1px rgba(255, 255, 255, 0.75);
    vertical-align: middle;
    cursor: pointer;
    background-color: #f5f5f5;
    background-image: -moz-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: -ms-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#ffffff), to(#e6e6e6));
    background-image: -webkit-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: -o-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: linear-gradient(top, #ffffff, #e6e6e6);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#e6e6e6', GradientType=0);
    border-color: #e6e6e6 #e6e6e6 #bfbfbf;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #e6e6e6;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
    border: 1px solid #cccccc;
    *border: 0;
    border-bottom-color: #b3b3b3;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    *margin-left: .3em;
    -webkit-box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
}
.dropdown-btn:hover,
.dropdown-btn:active,
.dropdown-btn.active,
.dropdown-btn.disabled,
.dropdown-btn[disabled] {
    background-color: #e6e6e6;
    *background-color: #d9d9d9;
}
.dropdown-btn:active,
.dropdown-btn.active { background-color: #cccccc \9 }
.dropdown-btn:first-child { *margin-left: 0 }
.dropdown-btn:hover {
    color: #333333;
    text-decoration: none;
    background-color: #e6e6e6;
    *background-color: #d9d9d9;
    /* Buttons in IE7 don't get borders, so darken on hover */
    background-position: 0 -15px;
    -webkit-transition: background-position 0.1s linear;
    -moz-transition: background-position 0.1s linear;
    -ms-transition: background-position 0.1s linear;
    -o-transition: background-position 0.1s linear;
    transition: background-position 0.1s linear;
}
.dropdown-btn:focus {
    outline: thin dotted #333;
    outline: 5px auto -webkit-focus-ring-color;
    outline-offset: -2px;
}
.dropdown-btn.active,
.dropdown-btn:active {
    background-color: #e6e6e6;
    background-color: #d9d9d9 \9;
    background-image: none;
    outline: 0;
    -webkit-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
}
.dropdown-btn.disabled,
.dropdown-btn[disabled] {
    cursor: default;
    background-color: #e6e6e6;
    background-image: none;
    opacity: 0.65;
    filter: alpha(opacity=65);
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;
}
.dropdown-btn-large {
    padding: 9px 14px;
    font-size: 15px;
    line-height: normal;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
}
.dropdown-btn-large [class^="icon-"] { margin-top: 1px }
.dropdown-btn-small {
    padding: 5px 9px;
    font-size: 11px;
    line-height: 16px;
}
.dropdown-btn-small [class^="icon-"] { margin-top: -1px }
.dropdown-btn-mini {
    padding: 2px 6px;
    font-size: 11px;
    line-height: 14px;
}
.dropdown-btn-primary,
.dropdown-btn-primary:hover,
.dropdown-btn-warning,
.dropdown-btn-warning:hover,
.dropdown-btn-danger,
.dropdown-btn-danger:hover,
.dropdown-btn-success,
.dropdown-btn-success:hover,
.dropdown-btn-info,
.dropdown-btn-info:hover,
.dropdown-btn-inverse,
.dropdown-btn-inverse:hover {
    color: #ffffff;
    text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
}
.dropdown-btn-primary.active,
.dropdown-btn-warning.active,
.dropdown-btn-danger.active,
.dropdown-btn-success.active,
.dropdown-btn-info.active,
.dropdown-btn-inverse.active { color: rgba(255, 255, 255, 0.75) }
.dropdown-btn {
    border-color: #ccc;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
}
.dropdown-btn-primary {
    background-color: #0074cc;
    background-image: -moz-linear-gradient(top, #0088cc, #0055cc);
    background-image: -ms-linear-gradient(top, #0088cc, #0055cc);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#0088cc), to(#0055cc));
    background-image: -webkit-linear-gradient(top, #0088cc, #0055cc);
    background-image: -o-linear-gradient(top, #0088cc, #0055cc);
    background-image: linear-gradient(top, #0088cc, #0055cc);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#0088cc', endColorstr='#0055cc', GradientType=0);
    border-color: #0055cc #0055cc #003580;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #0055cc;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-primary:hover,
.dropdown-btn-primary:active,
.dropdown-btn-primary.active,
.dropdown-btn-primary.disabled,
.dropdown-btn-primary[disabled] {
    background-color: #0055cc;
    *background-color: #004ab3;
}
.dropdown-btn-primary:active,
.dropdown-btn-primary.active { background-color: #004099 \9 }
.dropdown-btn-warning {
    background-color: #faa732;
    background-image: -moz-linear-gradient(top, #fbb450, #f89406);
    background-image: -ms-linear-gradient(top, #fbb450, #f89406);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#fbb450), to(#f89406));
    background-image: -webkit-linear-gradient(top, #fbb450, #f89406);
    background-image: -o-linear-gradient(top, #fbb450, #f89406);
    background-image: linear-gradient(top, #fbb450, #f89406);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fbb450', endColorstr='#f89406', GradientType=0);
    border-color: #f89406 #f89406 #ad6704;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #f89406;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-warning:hover,
.dropdown-btn-warning:active,
.dropdown-btn-warning.active,
.dropdown-btn-warning.disabled,
.dropdown-btn-warning[disabled] {
    background-color: #f89406;
    *background-color: #df8505;
}
.dropdown-btn-warning:active,
.dropdown-btn-warning.active { background-color: #c67605 \9 }
.dropdown-btn-danger {
    background-color: #da4f49;
    background-image: -moz-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: -ms-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#ee5f5b), to(#bd362f));
    background-image: -webkit-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: -o-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: linear-gradient(top, #ee5f5b, #bd362f);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ee5f5b', endColorstr='#bd362f', GradientType=0);
    border-color: #bd362f #bd362f #802420;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #bd362f;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-danger:hover,
.dropdown-btn-danger:active,
.dropdown-btn-danger.active,
.dropdown-btn-danger.disabled,
.dropdown-btn-danger[disabled] {
    background-color: #bd362f;
    *background-color: #a9302a;
}
.dropdown-btn-danger:active,
.dropdown-btn-danger.active { background-color: #942a25 \9 }
.dropdown-btn-success {
    background-color: #5bb75b;
    background-image: -moz-linear-gradient(top, #62c462, #51a351);
    background-image: -ms-linear-gradient(top, #62c462, #51a351);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#62c462), to(#51a351));
    background-image: -webkit-linear-gradient(top, #62c462, #51a351);
    background-image: -o-linear-gradient(top, #62c462, #51a351);
    background-image: linear-gradient(top, #62c462, #51a351);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#62c462', endColorstr='#51a351', GradientType=0);
    border-color: #51a351 #51a351 #387038;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #51a351;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-success:hover,
.dropdown-btn-success:active,
.dropdown-btn-success.active,
.dropdown-btn-success.disabled,
.dropdown-btn-success[disabled] {
    background-color: #51a351;
    *background-color: #499249;
}
.dropdown-btn-success:active,
.dropdown-btn-success.active { background-color: #408140 \9 }
.dropdown-btn-info {
    background-color: #49afcd;
    background-image: -moz-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: -ms-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#5bc0de), to(#2f96b4));
    background-image: -webkit-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: -o-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: linear-gradient(top, #5bc0de, #2f96b4);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#5bc0de', endColorstr='#2f96b4', GradientType=0);
    border-color: #2f96b4 #2f96b4 #1f6377;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #2f96b4;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-info:hover,
.dropdown-btn-info:active,
.dropdown-btn-info.active,
.dropdown-btn-info.disabled,
.dropdown-btn-info[disabled] {
    background-color: #2f96b4;
    *background-color: #2a85a0;
}
.dropdown-btn-info:active,
.dropdown-btn-info.active { background-color: #24748c \9 }
.dropdown-btn-inverse {
    background-color: #414141;
    background-image: -moz-linear-gradient(top, #555555, #222222);
    background-image: -ms-linear-gradient(top, #555555, #222222);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#555555), to(#222222));
    background-image: -webkit-linear-gradient(top, #555555, #222222);
    background-image: -o-linear-gradient(top, #555555, #222222);
    background-image: linear-gradient(top, #555555, #222222);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#555555', endColorstr='#222222', GradientType=0);
    border-color: #222222 #222222 #000000;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #222222;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-inverse:hover,
.dropdown-btn-inverse:active,
.dropdown-btn-inverse.active,
.dropdown-btn-inverse.disabled,
.dropdown-btn-inverse[disabled] {
    background-color: #222222;
    *background-color: #151515;
}
.dropdown-btn-inverse:active,
.dropdown-btn-inverse.active { background-color: #080808 \9 }
button.dropdown-btn,
input[type="submit"].dropdown-btn {
    *padding-top: 2px;
    *padding-bottom: 2px;
}
button.dropdown-btn::-moz-focus-inner,
input[type="submit"].dropdown-btn::-moz-focus-inner {
    padding: 0;
    border: 0;
}
button.dropdown-btn.dropdown-btn-large,
input[type="submit"].dropdown-btn.dropdown-btn-large {
    *padding-top: 7px;
    *padding-bottom: 7px;
}
button.dropdown-btn.dropdown-btn-small,
input[type="submit"].dropdown-btn.dropdown-btn-small {
    *padding-top: 3px;
    *padding-bottom: 3px;
}
button.dropdown-btn.dropdown-btn-mini,
input[type="submit"].dropdown-btn.dropdown-btn-mini {
    *padding-top: 1px;
    *padding-bottom: 1px;
}
.btn-group {
    position: relative;
    *zoom: 1;
    *margin-left: .3em;
}
.btn-group:before,
.btn-group:after {
    display: table;
    content: "";
}
.btn-group:after { clear: both }
.btn-group:first-child { *margin-left: 0 }
.btn-group + .btn-group { margin-left: 5px }
.dropdown-btn-toolbar {
    margin-top: 9px;
    margin-bottom: 9px;
}
.dropdown-btn-toolbar .btn-group {
    display: inline-block;
    *display: inline;
    /* IE7 inline-block hack */
    *zoom: 1;
}
.btn-group > .dropdown-btn {
    position: relative;
    float: left;
    margin-left: -1px;
    -webkit-border-radius: 0;
    -moz-border-radius: 0;
    border-radius: 0;
}
.btn-group > .dropdown-btn:first-child {
    margin-left: 0;
    -webkit-border-top-left-radius: 4px;
    -moz-border-radius-topleft: 4px;
    border-top-left-radius: 4px;
    -webkit-border-bottom-left-radius: 4px;
    -moz-border-radius-bottomleft: 4px;
    border-bottom-left-radius: 4px;
}
.btn-group > .dropdown-btn:last-child,
.btn-group > .dropdown-toggle {
    -webkit-border-top-right-radius: 4px;
    -moz-border-radius-topright: 4px;
    border-top-right-radius: 4px;
    -webkit-border-bottom-right-radius: 4px;
    -moz-border-radius-bottomright: 4px;
    border-bottom-right-radius: 4px;
}
.btn-group > .dropdown-btn.large:first-child {
    margin-left: 0;
    -webkit-border-top-left-radius: 6px;
    -moz-border-radius-topleft: 6px;
    border-top-left-radius: 6px;
    -webkit-border-bottom-left-radius: 6px;
    -moz-border-radius-bottomleft: 6px;
    border-bottom-left-radius: 6px;
}
.btn-group > .dropdown-btn.large:last-child,
.btn-group > .large.dropdown-toggle {
    -webkit-border-top-right-radius: 6px;
    -moz-border-radius-topright: 6px;
    border-top-right-radius: 6px;
    -webkit-border-bottom-right-radius: 6px;
    -moz-border-radius-bottomright: 6px;
    border-bottom-right-radius: 6px;
}
.btn-group > .dropdown-btn:hover,
.btn-group > .dropdown-btn:focus,
.btn-group > .dropdown-btn:active,
.btn-group > .dropdown-btn.active { z-index: 2 }
.btn-group .dropdown-toggle:active,
.btn-group.open .dropdown-toggle { outline: 0 }
.btn-group > .dropdown-toggle {
    padding-left: 8px;
    padding-right: 8px;
    -webkit-box-shadow: inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    *padding-top: 4px;
    *padding-bottom: 4px;
}
.btn-group > .dropdown-btn-mini.dropdown-toggle {
    padding-left: 5px;
    padding-right: 5px;
}
.btn-group > .dropdown-btn-small.dropdown-toggle {
    *padding-top: 4px;
    *padding-bottom: 4px;
}
.btn-group > .dropdown-btn-large.dropdown-toggle {
    padding-left: 12px;
    padding-right: 12px;
}
.btn-group.open .dropdown-toggle {
    background-image: none;
    -webkit-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
}
.btn-group.open .dropdown-btn.dropdown-toggle { background-color: #e6e6e6 }
.btn-group.open .dropdown-btn-primary.dropdown-toggle { background-color: #0055cc }
.btn-group.open .dropdown-btn-warning.dropdown-toggle { background-color: #f89406 }
.btn-group.open .dropdown-btn-danger.dropdown-toggle { background-color: #bd362f }
.btn-group.open .dropdown-btn-success.dropdown-toggle { background-color: #51a351 }
.btn-group.open .dropdown-btn-info.dropdown-toggle { background-color: #2f96b4 }
.btn-group.open .dropdown-btn-inverse.dropdown-toggle { background-color: #222222 }
.dropdown-btn .caret {
    margin-top: 7px;
    margin-left: 0;
}
.dropdown-btn:hover .caret,
.open.btn-group .caret {
    opacity: 1;
    filter: alpha(opacity=100);
}
.dropdown-btn-mini .caret { margin-top: 5px }
.dropdown-btn-small .caret { margin-top: 6px }
.dropdown-btn-large .caret {
    margin-top: 6px;
    border-left-width: 5px;
    border-right-width: 5px;
    border-top-width: 5px;
}
.dropup .dropdown-btn-large .caret {
    border-bottom: 5px solid #000000;
    border-top: 0;
}
.dropdown-btn-primary .caret,
.dropdown-btn-warning .caret,
.dropdown-btn-danger .caret,
.dropdown-btn-info .caret,
.dropdown-btn-success .caret,
.dropdown-btn-inverse .caret {
    border-top-color: #ffffff;
    border-bottom-color: #ffffff;
    opacity: 0.75;
    filter: alpha(opacity=75);
}

dropdown-btn.js

$('.dropdown-btn').on('click.dropdownbtn', function(e) {
    e.stopPropagation();
    e.preventDefault();
    $(this).children('.dropdown-toggle').trigger('click.dropdown.data-api');
});

dropdown-buttons.less

// DROPDOWN BUTTON STYLES
// -------------


// Base styles
// --------------------------------------------------

// Core
.dropdown-btn {
  display: inline-block;
  .ie7-inline-block();
  padding: 4px 10px 4px;
  margin-bottom: 0; // For input.dropdown-btn
  font-size: @baseFontSize;
  line-height: @baseLineHeight;
  *line-height: 20px;
  color: @grayDark;
  text-align: center;
  text-shadow: 0 1px 1px rgba(255,255,255,.75);
  vertical-align: middle;
  cursor: pointer;
  .buttonBackground(@btnBackground, @btnBackgroundHighlight);
  border: 1px solid @btnBorder;
  *border: 0; // Remove the border to prevent IE7's black border on input:focus
  border-bottom-color: darken(@btnBorder, 10%);
  .border-radius(4px);
  .ie7-restore-left-whitespace(); // Give IE7 some love
  .box-shadow(~"inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05)");
}

// Hover state
.dropdown-btn:hover {
  color: @grayDark;
  text-decoration: none;
  background-color: darken(@white, 10%);
  *background-color: darken(@white, 15%); /* Buttons in IE7 don't get borders, so darken on hover */
  background-position: 0 -15px;

  // transition is only when going to hover, otherwise the background
  // behind the gradient (there for IE<=9 fallback) gets mismatched
  .transition(background-position .1s linear);
}

// Focus state for keyboard and accessibility
.dropdown-btn:focus {
  .tab-focus();
}

// Active state
.dropdown-btn.active,
.dropdown-btn:active {
  background-color: darken(@white, 10%);
  background-color: darken(@white, 15%) e("\9");
  background-image: none;
  outline: 0;
  .box-shadow(~"inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05)");
}

// Disabled state
.dropdown-btn.disabled,
.dropdown-btn[disabled] {
  cursor: default;
  background-color: darken(@white, 10%);
  background-image: none;
  .opacity(65);
  .box-shadow(none);
}


// Button Sizes
// --------------------------------------------------

// Large
.dropdown-btn-large {
  padding: 9px 14px;
  font-size: @baseFontSize + 2px;
  line-height: normal;
  .border-radius(5px);
}
.dropdown-btn-large [class^="icon-"] {
  margin-top: 1px;
}

// Small
.dropdown-btn-small {
  padding: 5px 9px;
  font-size: @baseFontSize - 2px;
  line-height: @baseLineHeight - 2px;
}
.dropdown-btn-small [class^="icon-"] {
  margin-top: -1px;
}

// Mini
.dropdown-btn-mini {
  padding: 2px 6px;
  font-size: @baseFontSize - 2px;
  line-height: @baseLineHeight - 4px;
}


// Alternate buttons
// --------------------------------------------------

// Set text color
// -------------------------
.dropdown-btn-primary,
.dropdown-btn-primary:hover,
.dropdown-btn-warning,
.dropdown-btn-warning:hover,
.dropdown-btn-danger,
.dropdown-btn-danger:hover,
.dropdown-btn-success,
.dropdown-btn-success:hover,
.dropdown-btn-info,
.dropdown-btn-info:hover,
.dropdown-btn-inverse,
.dropdown-btn-inverse:hover {
  color: @white;
  text-shadow: 0 -1px 0 rgba(0,0,0,.25);
}
// Provide *some* extra contrast for those who can get it
.dropdown-btn-primary.active,
.dropdown-btn-warning.active,
.dropdown-btn-danger.active,
.dropdown-btn-success.active,
.dropdown-btn-info.active,
.dropdown-btn-inverse.active {
  color: rgba(255,255,255,.75);
}

// Set the backgrounds
// -------------------------
.dropdown-btn {
  // reset here as of 2.0.3 due to Recess property order
  border-color: #ccc;
  border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) rgba(0,0,0,.25);
}
.dropdown-btn-primary {
  .buttonBackground(@btnPrimaryBackground, @btnPrimaryBackgroundHighlight);
}
// Warning appears are orange
.dropdown-btn-warning {
  .buttonBackground(@btnWarningBackground, @btnWarningBackgroundHighlight);
}
// Danger and error appear as red
.dropdown-btn-danger {
  .buttonBackground(@btnDangerBackground, @btnDangerBackgroundHighlight);
}
// Success appears as green
.dropdown-btn-success {
  .buttonBackground(@btnSuccessBackground, @btnSuccessBackgroundHighlight);
}
// Info appears as a neutral blue
.dropdown-btn-info {
  .buttonBackground(@btnInfoBackground, @btnInfoBackgroundHighlight);
}
// Inverse appears as dark gray
.dropdown-btn-inverse {
  .buttonBackground(@btnInverseBackground, @btnInverseBackgroundHighlight);
}


// Cross-browser Jank
// --------------------------------------------------

button.dropdown-btn,
input[type="submit"].dropdown-btn {

  // Firefox 3.6 only I believe
  &::-moz-focus-inner {
    padding: 0;
    border: 0;
  }

  // IE7 has some default padding on button controls
  *padding-top: 2px;
  *padding-bottom: 2px;
  &.dropdown-btn-large {
    *padding-top: 7px;
    *padding-bottom: 7px;
  }
  &.dropdown-btn-small {
    *padding-top: 3px;
    *padding-bottom: 3px;
  }
  &.dropdown-btn-mini {
    *padding-top: 1px;
    *padding-bottom: 1px;
  }
}

dropdown-groups.less

// DROPDOWN BUTTON GROUPS
// -------------


// Make the div behave like a button
.btn-group {
  position: relative;
  .clearfix(); // clears the floated buttons
  .ie7-restore-left-whitespace();
}

// Space out series of button groups
.btn-group + .btn-group {
  margin-left: 5px;
}

// Optional: Group multiple button groups together for a toolbar
.dropdown-btn-toolbar {
  margin-top: @baseLineHeight / 2;
  margin-bottom: @baseLineHeight / 2;
  .btn-group {
    display: inline-block;
    .ie7-inline-block();
  }
}

// Float them, remove border radius, then re-add to first and last elements
.btn-group > .dropdown-btn {
  position: relative;
  float: left;
  margin-left: -1px;
  .border-radius(0);
}
// Set corners individual because sometimes a single button can be in a .btn-group and we need :first-child and :last-child to both match
.btn-group > .dropdown-btn:first-child {
  margin-left: 0;
     -webkit-border-top-left-radius: 4px;
         -moz-border-radius-topleft: 4px;
             border-top-left-radius: 4px;
  -webkit-border-bottom-left-radius: 4px;
      -moz-border-radius-bottomleft: 4px;
          border-bottom-left-radius: 4px;
}
// Need .dropdown-toggle since :last-child doesn't apply given a .dropdown-menu immediately after it
.btn-group > .dropdown-btn:last-child,
.btn-group > .dropdown-toggle {
     -webkit-border-top-right-radius: 4px;
         -moz-border-radius-topright: 4px;
             border-top-right-radius: 4px;
  -webkit-border-bottom-right-radius: 4px;
      -moz-border-radius-bottomright: 4px;
          border-bottom-right-radius: 4px;
}
// Reset corners for large buttons
.btn-group > .dropdown-btn.large:first-child {
  margin-left: 0;
     -webkit-border-top-left-radius: 6px;
         -moz-border-radius-topleft: 6px;
             border-top-left-radius: 6px;
  -webkit-border-bottom-left-radius: 6px;
      -moz-border-radius-bottomleft: 6px;
          border-bottom-left-radius: 6px;
}
.btn-group > .dropdown-btn.large:last-child,
.btn-group > .large.dropdown-toggle {
     -webkit-border-top-right-radius: 6px;
         -moz-border-radius-topright: 6px;
             border-top-right-radius: 6px;
  -webkit-border-bottom-right-radius: 6px;
      -moz-border-radius-bottomright: 6px;
          border-bottom-right-radius: 6px;
}

// On hover/focus/active, bring the proper btn to front
.btn-group > .dropdown-btn:hover,
.btn-group > .dropdown-btn:focus,
.btn-group > .dropdown-btn:active,
.btn-group > .dropdown-btn.active {
  z-index: 2;
}

// On active and open, don't show outline
.btn-group .dropdown-toggle:active,
.btn-group.open .dropdown-toggle {
  outline: 0;
}



// Split button dropdowns
// ----------------------

// Give the line between buttons some depth
.btn-group > .dropdown-toggle {
  padding-left: 8px;
  padding-right: 8px;
  .box-shadow(~"inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05)");
  *padding-top: 4px;
  *padding-bottom: 4px;
}
.btn-group > .dropdown-btn-mini.dropdown-toggle {
  padding-left: 5px;
  padding-right: 5px;
}
.btn-group > .dropdown-btn-small.dropdown-toggle {
  *padding-top: 4px;
  *padding-bottom: 4px;
}
.btn-group > .dropdown-btn-large.dropdown-toggle {
  padding-left: 12px;
  padding-right: 12px;
}

.btn-group.open {

  // The clickable button for toggling the menu
  // Remove the gradient and set the same inset shadow as the :active state
  .dropdown-toggle {
    background-image: none;
    .box-shadow(~"inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05)");
  }

  // Keep the hover's background when dropdown is open
  .dropdown-btn.dropdown-toggle {
    background-color: @btnBackgroundHighlight;
  }
  .dropdown-btn-primary.dropdown-toggle {
    background-color: @btnPrimaryBackgroundHighlight;
  }
  .dropdown-btn-warning.dropdown-toggle {
    background-color: @btnWarningBackgroundHighlight;
  }
  .dropdown-btn-danger.dropdown-toggle {
    background-color: @btnDangerBackgroundHighlight;
  }
  .dropdown-btn-success.dropdown-toggle {
    background-color: @btnSuccessBackgroundHighlight;
  }
  .dropdown-btn-info.dropdown-toggle {
    background-color: @btnInfoBackgroundHighlight;
  }
  .dropdown-btn-inverse.dropdown-toggle {
    background-color: @btnInverseBackgroundHighlight;
  }
}


// Reposition the caret
.dropdown-btn .caret {
  margin-top: 7px;
  margin-left: 0;
}
.dropdown-btn:hover .caret,
.open.btn-group .caret {
  .opacity(100);
}
// Carets in other button sizes
.dropdown-btn-mini .caret {
  margin-top: 5px;
}
.dropdown-btn-small .caret {
  margin-top: 6px;
}
.dropdown-btn-large .caret {
  margin-top: 6px;
  border-left-width:  5px;
  border-right-width: 5px;
  border-top-width:   5px;
}
// Upside down carets for .dropup
.dropup .dropdown-btn-large .caret {
  border-bottom: 5px solid @black;
  border-top: 0;
}



// Account for other colors
.dropdown-btn-primary,
.dropdown-btn-warning,
.dropdown-btn-danger,
.dropdown-btn-info,
.dropdown-btn-success,
.dropdown-btn-inverse {
  .caret {
    border-top-color: @white;
    border-bottom-color: @white;
    .opacity(75);
  }
}