title: How To customize the selection of multiple items in a surfaceListBox
body: <p>I have a surfaceListBox that contains many items.
  when I put the SelectionMode to multiple , every thing is fine and I click on an item to add it to the selectionItems,
  But I want to get the same behaviour but not with clicking on the items but when the touch is moving over the item , 
  Here is some details of the manipulation I want to add:</p>
  
  <p>if the touch is moving over a surfacelistboxitem , this item is added to the selectedItems .
  Thanks for your help</p>