[TIMOB-4482] Android: Tabgroup.animate not working on Android 2.2 with Ti sdk 1.7.0

/*
var tabGroup = Ti.UI.createTabGroup({bottom:-50});
tabGroup.addTab(Ti.UI.createTab({
    title: 'Tab 1',
    window: Ti.UI.createWindow({ backgroundColor: 'red', url: 'sub.js' })
}));
tabGroup.addTab(Ti.UI.createTab({
    title: 'Tab 2',
    window: Ti.UI.createWindow({ backgroundColor: 'blue', url: 'sub.js' })
}));
tabGroup.open();
*/

// 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({bottom:-50});
 
//
// 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 toggleBtn = Titanium.UI.createButton({
    top:40,
    height:35,
    width:150,
    title:'toggle tab bar'
});
 
win1.add(toggleBtn);
toggleBtn.addEventListener('click', function(e){
 
    if (tabGroup.tabBarVisible == true) {
        tabGroup.animate({bottom:-50,duration:500});
        tabGroup.tabBarVisible = false;
    } else {
        tabGroup.animate({bottom:0,duration:500});
        tabGroup.tabBarVisible = true;
    }
});
 
//
// create controls tab and root window
//
var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    backgroundColor:'#fff'
});
var tab2 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 2',
    window:win2
});
 
var label2 = Titanium.UI.createLabel({
    color:'#999',
    text:'I am Window 2',
    font:{fontSize:20,fontFamily:'Helvetica Neue'},
    textAlign:'center',
    width:'auto'
});
 
win2.add(label2);
 
 
 
//
//  add tabs
//
tabGroup.addTab(tab1);  
tabGroup.addTab(tab2);  
 
 
// open tab group
tabGroup.open();