[TIMOB-19339] iOS: iPad SplitWindow - Hiding master view breaks Navigation Window

   var masterOpen = true;
   
   var HomeView = Ti.UI.createWindow({
   	backgroundColor : 'brown'
   });
   
   //Master Navigation Window for Split View
   var masterView = Ti.UI.createWindow({
   	title : "Testing",
   });
   var masterTable = Ti.UI.createTableView();
   for (var x = 0; x < 5; x++) {
   	//Creates a tableView for child table
   	var subTable = Ti.UI.createTableView();
   	for (var i = 0; i < 3; i++) {
   		//Adds rows to the sub table
   		subTable.appendRow(Ti.UI.createTableViewRow({
   			title : "subRow" + i,
   		}));
   	}
   	//creates a window to contain the sub table
   	var subView = Ti.UI.createWindow({
   		title : "subTable" + x,
   	});
   	subView.add(subTable);
   
   	//appends the row to the masterView table
   	masterTable.appendRow({
   		title : "row" + x,
   		childTable : subView,
   		hasChild : true,
   	});
   }
   masterView.add(masterTable);
   
   //Creates navigation Window with master table
   var masterNavWindow = Ti.UI.iOS.createNavigationWindow({
   	window : masterView,
   });
   
   //Event Listener for click event. If row has child, open child
   masterTable.addEventListener("click", function(c) {
   	Ti.API.info(JSON.stringify(c));
   	if (c.row.hasChild) {
   		Ti.API.info("Opening sub Table");
   		masterNavWindow.openWindow(c.row.childTable);
   	} else {
   		Ti.API.warn("c.row does not have child");
   	}
   });
   
   //Create detail window
   var detailWindow = Ti.UI.createWindow({
   	title : "This is a detail Window",
   });
   //Create detail View and add a label
   var detailView = Ti.UI.createView();
   detailView.label = Ti.UI.createLabel({
   	text : "Hello World"
   });
   detailView.add(detailView.label);
   detailWindow.add(detailView);
   
   //Create detail Navigation Window
   var detailNavWindow = Ti.UI.iOS.createNavigationWindow({
   	window : detailWindow,
   });
   
   
   var self = Ti.UI.iOS.createSplitWindow({
   	backgroundColor : "#1B457E",
   	masterView : masterNavWindow,
   	detailView : detailNavWindow,
   	showMasterInPortrait : true
   });
   
   var masterButton = Ti.UI.createButton({
   	title : "\u2630",
   });
   detailWindow.leftNavButton = (detailWindow.orientation == Ti.UI.PORTRAIT || detailWindow.orientation == Ti.UI.UPSIDE_PORTRAIT) ? masterButton : null;
   
   //Button is used to hide/show masterView in portrait orientation
   masterButton.addEventListener("click", function(mastClick) {
   	self.showMasterInPortrait = !masterOpen;
   	masterOpen = !masterOpen;
   });
   
   Ti.Gesture.addEventListener('orientationchange', function(e) {
   	if (e.orientation == Ti.UI.PORTRAIT || e.orientation == Ti.UI.UPSIDE_PORTRAIT) {
   		detailWindow.leftNavButton = masterButton;
   		self.showMasterInPortrait = masterOpen;
   	} else if (e.orientation == Ti.UI.LANDSCAPE_LEFT || e.orientation == Ti.UI.LANDSCAPE_RIGHT) {
   		detailWindow.leftNavButton = null;
   		self.showMasterInPortrait = false;
   	}
   });
   
   self.open();