app.js

Titanium.UI.setBackgroundColor('#000');

//Main Tab Group
var tabGroup = Titanium.UI.createTabGroup();

//Photo Selection Window
var photosWindow = Titanium.UI.createWindow({  
  url:'photos.js',
  title:'Photos',
  backgroundColor:'#fff'
});
var photosTab = Titanium.UI.createTab({  
  icon:'43-film-roll.png',
  title:'Photos',
  window:photosWindow
});

//Configuration Window
var configWindow = Titanium.UI.createWindow({  
  url:'config.js',
  title:'Configuration',
  backgroundColor:'#fff'
});
var configTab = Titanium.UI.createTab({  
  icon:'19-gear.png',
  title:'Configuration',
  window:configWindow
});

//Add tabs and open tab group
tabGroup.addTab(photosTab);
tabGroup.addTab(configTab);
tabGroup.open();

config.js

function header(text) {
  return Ti.UI.createLabel({
    top:10,
    text:text,
    height:'auto',
    width:'auto',
    font:{
      fontWeight:'bold',
      fontSize:20
    }
  });
}

var configContainer = Ti.UI.createView({
  top:10,
  height:'auto',
  width:'auto',
  layout:'vertical'
});

configContainer.add(header('Twitter Username'));

var unField = Titanium.UI.createTextField({
	value:'kevinwhinnery',
	height:35,
	top:10,
	width:250,
	hintText:'Twitter Username',
	keyboardType:Titanium.UI.KEYBOARD_DEFAULT,
	returnKeyType:Titanium.UI.RETURNKEY_DEFAULT,
	borderStyle:Titanium.UI.INPUT_BORDERSTYLE_ROUNDED,
	autocorrect:false
});
configContainer.add(unField);

configContainer.add(header('Twitter Password'));

var pwField = Titanium.UI.createTextField({
	color:'#787878',
	value:'secret',
	height:35,
	top:10,
	width:250,
	hintText:'Twitter Password',
	keyboardType:Titanium.UI.KEYBOARD_DEFAULT,
	returnKeyType:Titanium.UI.RETURNKEY_DEFAULT,
	borderStyle:Titanium.UI.INPUT_BORDERSTYLE_ROUNDED,
	autocorrect:false,
	passwordMask:true
});
configContainer.add(pwField);

var saveButton = Ti.UI.createButton({
  top:10,
  title:'Save',
  height:40,
  width:100
});
configContainer.add(saveButton);

Ti.UI.currentWindow.add(configContainer);

photos.js

var win = Ti.UI.currentWindow;

var photoOptions = Ti.UI.createView({
  top:10,
  height:'auto',
  width:'auto',
  layout:'vertical'
});

var galleryButton = Ti.UI.createButton({
  title:'Choose A Photo',
  top:10,
  height:40,
  width:200
});

var cameraButton = Ti.UI.createButton({
  title:'Take A Photo',
  top:10,
  height:40,
  width:200
});

var preview = Ti.UI.createImageView({
  top:10,
  height:150,
  width:150
});

var postButton = Ti.UI.createButton({
  title:'Oh Snap!',
  bottom:10,
  height:100,
  width:100
});

photoOptions.add(galleryButton);
photoOptions.add(cameraButton);
photoOptions.add(preview);

win.add(photoOptions);
win.add(postButton);