Hi Anatoly Chekh,
Here are the answer for your enquies:
a) RelativeDragPoint holds invormation relative to the e.Options.Destination. However, all drag drop events have bubble strategy and they bubble to their parents once they are raised. You can get the relative position to an element using the following code:
var transformation = Application.Current.RootVisual.TransformToVisual(element);
var resultPoint = transformation.Transform(e.Options.CurrentDragPoint);
b) Drop impossible is raised when leaving droppable area. This is needed since drag /drop events are not raised when mouse is not dropppable element.
c) Could you please share some additional information about this issue.
the Telerik team
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