Semi-Transparent Frame Flickerin Issue

Hi,

I'm trying to do the following... I am creating a control that has this composition...

Layer 0: the background panel of the control
Layer 1: A picture box that will be moved with mouse events
Layer 3: A User Created Transparent Panel with a semi-transparent border on it

the objective is move the image and put in a position that we like to crop te non colored part of the window
someting like this:

__________
|´´´´´´´´´ |
|´|100001|´|
|´|010010|´|
|´|001100|´|
|´´´´´´´´´´|
-------------

The "0" and "1" are the image
the ´´´´ is the semi tranparent border

the problem is that when I move the image the border and the pic kep flicking....
I tried to user double buffering but it just don't do a think

Please help me