Set ActiveIndex in LinearNavigation


Customizing the swipeGesture example ( 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:

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

	<SwipeNavigate SwipeDirection="Left"/>

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

Thanks for your help!