[TIMOB-15809] Android: Black window does not appear while clicking next window

var _window = Titanium.UI.createWindow();
if(!(Ti.Platform.osname == 'android')) { // effectively a list of supported platforms
	        var label = tpl.ui.getSkipLabel();
	        _window.add(label);
	        return _window;
	    }
	/**
	 * Creates a simple black light weight window
	 */
	function LightWeightWindow(){
	    var win = Ti.UI.createWindow({
	        backgroundColor: 'black',
	    });
	 
	    return win;
	}
	 
	/**
	 * Creates a heavy weight window
	 * @param {Number} num  the window number
	 */
	function HeavyWeightWindow(num){
	    num ++;
	    // create the window
	    var win = Ti.UI.createWindow({
	        fullscreen: false, // make it heavy weight
	        backgroundColor: '#ccc',
	        title: 'win '+num
	    });
	 
	    // let's do some processing
	    for(var i = 0; i < 200; i++) {
	        win.add(Ti.UI.createView({width:0,height:0,left:0,top:0}));
	    }
	 
	    // open next window
	    var btn = Ti.UI.createButton({
	        title: 'open win ' + (num + 1)
	    });
	 
	    btn.addEventListener('click', function(){
	        // open light weight window
	        var lightWeight = LightWeightWindow();
	        lightWeight.open();
	        // create the next heavy weight window
	        var next =  HeavyWeightWindow(num);
	        // open the heavy weight window
	        next.open();
	        // lastly, close the light weight window
	        lightWeight.close();
	    });
	 
	    // on focus, show the toast notification
	    win.addEventListener('focus', function(){
	        Ti.UI.createNotification({
	            message:'focus on win '+ num,
	            duration: Ti.UI.NOTIFICATION_DURATION_SHORT
	        }).show();
	 
	        Ti.API.info('focus on win '+ num)
	    });
		win.addEventListener('blur', function(){
  
        	Ti.API.info('blur on win '+ num)
    	});
	 
	    win.add(btn);
	 
	    return win;
	}
	 
	_window=HeavyWeightWindow(0);
 _window.open();