Alloy - SplitWindow with navgroups in master and detail

app.tss

"Window": {
    backgroundColor: '#fff'
}

"Label": {
    color: '#000',
    font: {
        fontSize: 32,
        fontWeight: 'bold'
    }
}

detail.xml

<Alloy>
    <Window>
		<NavigationGroup>
			<Window title="detail">
				<LeftNavButton>
					<Button>left</Button>
				</LeftNavButton>
				<RightNavButton>
					<Button>right</Button>
				</RightNavButton>
				
				<Label>detail</Label>
			</Window>
		</NavigationGroup>
	</Window>
</Alloy>

index.js

$.index.open();

index.xml

<Alloy>
    <SplitWindow id="index" formFactor="tablet" platform="ios">
        <Require src="master"/>
        <Require src="detail"/>
    </SplitWindow>
</Alloy>

master.xml

<Alloy>
    <Window>
		<NavigationGroup>
			<Window title="master">
				<LeftNavButton>
					<Button>left</Button>
				</LeftNavButton>
				<RightNavButton>
					<Button>right</Button>
				</RightNavButton>
				
				<Label>master</Label>
			</Window>
		</NavigationGroup>
	</Window>
</Alloy>