[TIMOB-7562] iOS: Titanium.UI.View: view with layout property set to horizontal or vertical does not display children

When the layout property of a View is set to 'vertical' or 'horizontal', children do not display. Works on Android. Tested on Views and Windows using Labels, TextFields, and Buttons. Steps to Reproduce: 1. Run Code:

var win = Ti.UI.createWindow({
	backgroundColor:'red',
	layout:'horizontal'
});

var left = Ti.UI.createLabel({
	title:'Left',
	backgroundColor:'blue',
	color:'black',
	width:'50%',
	height:'100%'
});

var right = Ti.UI.createLabel({
	title:'Right',
	backgroundColor:'green',
	color:'black',
	width:'50%',
	height:'100%'
});

win.add(left);
win.add(right);

win.open();

Expected Result: There should be a blue bar and a green bar (two labels in a horizontal layout). Screenshot attached. Actual Result: Red background (only the window background). Screenshot attached.