[TIMOB-7773] iOS: Back/close animation broken when a NavigationGroup is in a TabGroup

// 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 label1 = Titanium.UI.createLabel({
	color:'#999',
	text:'I am Window 1',
	font:{fontSize:20,fontFamily:'Helvetica Neue'},
	textAlign:'center',
	width:'auto'
});

win1.add(label1);

//
// create controls tab and root window
//
var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    backgroundColor:'#fff',
  	navBarHidden: true
});
var tab2 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 2',
    window:win2
});


//Here's the first window...
var first = Ti.UI.createWindow({
  backgroundColor:"#fff",
  title:"My App"
});
var label = Ti.UI.createLabel({ text: "poke me to open the next window" });
first.add(label);

//Here's the nav group that will hold them both...
var navGroup = Ti.UI.iPhone.createNavigationGroup({
  window:first
});

//Here's a window we want to push onto the stack...
var second = Ti.UI.createWindow({
  background:"#fff",
  title:"Child Window"
});
second.add(Ti.UI.createLabel({
	top: 10,
	left: 10,
	width: 300,
	text:"If you did not select tab 1 yet, the back animation will be buggy. If you select tab 1 and come back here, the back animation works."
}));

//When the label on the first window receives a touch, open the second
label.addEventListener("click", function(e) {
  navGroup.open(second);
});

win2.add(navGroup);


//
//  add tabs
//  
tabGroup.addTab(tab1);
tabGroup.addTab(tab2);
tabGroup.setActiveTab(1);

// open tab group
tabGroup.open();