[TIMOB-10062] iOS: tabbedBar within toolBar visibility changes disrupt positioning and tabbedBar behavior

// this sets the background color of the master UIView (when there are no windows/tab groups on it)
var win = Titanium.UI.createWindow({
	layout : 'vertical'
});


var btn = Ti.UI.createButton({
	title : 'Toggle!'
});

var tabbedBar1 = Ti.UI.iOS.createTabbedBar({
	labels : ['One', 'Two'],
	visible: false
});

//tabbedBar1.visible = vis;

var tabbedBar2 = Ti.UI.iOS.createTabbedBar({
	labels : ['Three', 'Four']
});

var flexSpace = Ti.UI.createButton({
	systemButton : Titanium.UI.iPhone.SystemButton.FLEXIBLE_SPACE
});

btn.addEventListener('click', function(e){
	if(tabbedBar1.visible == false){
		tabbedBar1.visible = true;
	} else {
		tabbedBar1.visible = false;
	}
	Ti.API.info(tabbedBar1.visible);
});

win.add(btn);
win.setToolbar([tabbedBar1, flexSpace, tabbedBar2]);

win.open({
	modal : true
});