[TIMOB-15543] iOS: Views: The visible property of a view is undefined by default

var _window = Ti.UI.createWindow({
		backgroundColor:'white'
		});

		var view = Ti.UI.createView({
			backgroundColor:'red',
			width:100,
			height:100,
			top:20
		});
		_window.add(view);
		
		var b = Ti.UI.createButton({
			title:'Show/hide',
			width:140,
			height:40,
			top:160
		});
		
		b.addEventListener('click', function() {
			alert('Visible: '+view.visible);
			if (view.visible) {
				view.hide();
			}
			else {
				view.show();
			}
		});
		_window.add(b);
		_window.open();