Adorner issue for drag and drop controls

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C#

WPF

C#4.0

WPF-Toolkit

Like the paint application there are user controls to draw shapes (rectangle, circle, lie etc.). But when i drag and drop that control on page view all other controls are working properly except line control. In case of line when i drag & drop control it displayed very large on screen and i m not able to see adorner to make it small or big. line is displayed small but its adorner is very very big.

I tried to resolve this.. but couldnt get it .. Please help me..