Button group with multiple dropdowns model.

gistfile1.js

$scope.buttons = [
  {
    "type": "normal",
    "title": "First normal"
  },
  {
    "type": "normal",
    "title": "Second normal"
  },
  {
    "type": "dropdown",
    "title": "Third dropdown",
    "items": [
      {
        "title": "Dropdown link",
        "url": "#"
      },
      {
        "title": "Dropdown link",
        "url": "#"
      }
    ]
  },
  {
    "type": "dropdown",
    "title": "Forth dropdown",
    "items": [
      {
        "title": "Dropdown link",
        "url": "#"
      },
      {
        "title": "Dropdown link",
        "url": "#"
      }
    ]
  }
];