Appcelerator Titanium | Alloy | Put 2 NavigationWindow inside TabGroup

index.js

function openMaster() {
	var win = Ti.UI.createWindow({
		title: "Master 2",
		backgroundColor: 'red'
	});
	$.master_win.openWindow(win);
}

function openDetail() {
	var win = Ti.UI.createWindow({
		title: "Detail 2",
		backgroundColor: 'green'
	});
	$.detail_win.openWindow(win);
}

$.index.open();

index.tss

"Window": {
	backgroundColor:"white"
},
"Label": {
	color: "#000"
}

index.xml

<Alloy>
  <TabGroup>
    <Tab title="Tab 1" icon="KS_nav_ui.png">
      <SplitWindow id="splitWin" platform="ios" formFactor="tablet">
        <NavigationWindow id="master_win">
          <Window title="Master 1">
            <Label onClick="openMaster">Master</Label>
          </Window>
        </NavigationWindow>
        <NavigationWindow id="detail_win">
        	<Window title="Detail 1">
          	<Label onClick="openDetail">Detail</Label>
          </Window>
        </NavigationWindow>
      </SplitWindow>
    </Tab>
    <Tab title="Tab 2" icon="KS_nav_views.png">
      <Window title="Tab 2">
        <Label>I am Window 2</Label>
      </Window>
    </Tab>
  </TabGroup>
</Alloy>