[TIMOB-5826] iOS: Enabled Not Working for labels in TabbedBar

// this sets the background color of the master UIView (when there are no windows/tab groups on it)
Titanium.UI.setBackgroundColor('#000');
// create tab group
var tabGroup = Titanium.UI.createTabGroup();
//
// create base UI tab and root window
//
var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});
var tab1 = Titanium.UI.createTab({  
    icon:'KS_nav_views.png',
    title:'Tab 1',
    window:win1
});
 
var buttonObjects = [
    {title:'Shows', enabled:true},
    {title:'Try List', enabled:true},
    {title:'Been List', enabled:false},
];

var bb1 = Titanium.UI.createTabbedBar({
    labels:buttonObjects,
    backgroundColor:'#336699',
    top:0,
    style:Titanium.UI.iPhone.SystemButtonStyle.BAR,
    height:50,
    width:300
});
 
bb1.addEventListener('click', function(e)
{
	buttonObjects[1].enabled = false;
    bb1.labels = buttonObjects;
});
  
win1.add(bb1);
 
//
tabGroup.addTab(tab1);  
 
// open tab group
tabGroup.open();