onHold Vs Sizechanged (and possibly rotate)

One thing I'm finding when programming for the Surface is that if you trap one Gesture it will upset the operation of another gesture. So for instance (in my program) the PreviewContactDown is trapped to start a trap operation, this was also used to start a drag and drop operation, which interfered with each other. So I decided to start a drag drop operation by trapping the PreviewContactHoldgesture for the Scatterview item.

This though has a side effect. If a user tries to resize (and probably rotate) a scatterviewitem then one finger has to placed on the item and held. This will fire the PreviewContactHoldgesture for that item. So inside the PreviewContactHoldgesture handler, once the item that is being operated on then you need to find the number of contacts on that item. if it's more than one then it's not a plain Hold gesture. Here's the code I used:

int ContactsCaptured=draggedElement.ContactsCaptured.Count;
if (ContactsCaptured > 1){
//We may be rotating or scaling so we don't want to drag and drop
return;
}