[TIMOB-7615] Android: zIndex on Ti.UI.Window doesn't work properly

*Here is the code for app.js:*

var test = require('win2');

var win1 = Ti.UI.createWindow({
	zIndex: 1,
	backgroundColor:'red',
});

win1.addEventListener('click', function(){
	var win2 = test.anotherWin();
	win2.open();
});

win1.open(); 

*Here is the code for win2.js:*

exports.anotherWin = function(){
	var win = Ti.UI.createWindow({
		backgroundColor:'yellow',
		zIndex: 2
	});
	
	return win;
}

*What is supposed to happen:* When you tap on the red window once, it should display the yellow window. *What currently happens:* When you tap the red window once, nothing happens. When you tap it again, the yellow window is displayed. *Notes:* Without any zIndex, it seems to work fine. However with the zIndex, this issue occurs. Android TiSDK 1.8.1