The ListBox for Windows Phone controls support optical zoom functionality so users can manipulate the size of the items intuitively through pinch gestures. The zooming transformation is smooth and fluid so the performance of your application is not sacrificed.
You can customize the zoom using the ZoomMode and Zoom properties. The ZoomMode property gets or sets whether the zoom is enabled or disabled. The Zoom property the Zoom value applied to the control. The ZoomChanged event is triggered when the zoom value of the control is changed.