Question about drag and drop

We have a RadTabControl on our page.  The contents of the tab control include objects on a canvas.  The page registers drag and drop event handlers, for example:

            RadDragAndDropManager.AddDragQueryHandler(this, OnDragQuery);

The objects (a Rectangle, for example) are registered to allow Drag and Drop:

            RadDragAndDropManager.SetAllowDrag(Rect, true);

How can we get mouse events at the Canvas level?  We would like to allow the user to pan the view by dragging the canvas.  Similarly, we would like to use mouse wheel events.  We have registered the necessary event handlers, but LButtonDown, MouseMove, and MouseWheel events don't reach the Canvas.

Thanks for any ideas...