Drag n Drop in A User Control

I am using VB 8 and Expression Blend 3 for a WPF application. I created a User Control which has a canvas and inside it a Label. I implement a double click event and a drag n drop for the canvas.
When i drag a UserControl to another UserControl I want to copy the Label.content to the label.content of the target control

My problem is that when i do the drag n drop, the label is copied but the source canvas looses its doubleclick event. What happens here???
I can post the code if needed.