bring drawn rectangle to front

[TweeZz]

Hello all...

I have a problem (of course) and I can't seem to find a solution (of course).
Let me describe the problem. I have a GroupBox (VisualShed) which can contain a few PictureBoxes (Carpets). If there are no Carpet's in the VisualShed and I draw a rectangle, the rectangle is visible. So far so good...
But when the VisualShed contains some Carpets and I draw the rectangle again, I only can see the rectangle in the VisualShed on the places where there is no carpet.
Is there a way to bring the drawn rectangle in front of the Carpets?
To make it more clear I have made a screenshot which you can find here:

http://users.pandora.be/bratislava_TJ/screenShot.jpg

The problem (I think) is that I have to use the Graphics object of the GroupBox, because that is where I have to draw the rectangle. I have to be able to draw the rectangle over more than 1 Carpet.
I also tried to draw a rectangle on a Carpet itself (so with the graphics object of a carpet) and even that wouldn't work?

I have tried different things:
SetStyle(opaque, true);
BringToFront();

I hope someone can help me out here because the problem is driving me :sigh:
I don't have much experience in C# but I'm learning... I realy want to get this program solved!

Thanks in advance!

GreetZz,
TweeZz.

ps: If the problem doesnt seem clear... You can always ask me for the sourcecode!