Set ActiveIndex in LinearNavigation

Hi,

Customizing the swipeGesture example (https://www.fusetools.com/examples/swipe-gesture-reveal) I cannot manage to set some offset to the linear navigation. I would like to make it start on the second item instead of the first one.
Saw that LinearNavigation has an inherited ActiveIndex parameter. How can I set its value?

Tried this (+ other unsuccessful variations) so far:

<Panel>
	<LinearNavigation ux:Name="nav" ActiveIndex="2">
		<NavigationMotion GotoEasing="QuadraticOut" GotoDuration="0.3" ActiveIndex="3" />
	</LinearNavigation>

	<SwipeNavigate SwipeDirection="Left"/>

	<Each Count="10">
		<Card />	
	</Each>
</Panel>

Thanks for your help!