I know that I would have to make a custom designer for my control. The problem I am getting is that I have not used ITemplate in my custom control and I just dont want to use it for some reason. Instead, I have used Panel controls in my Custom Control. So, in this situation how can I make my custom designer so that there are two editable regions over it that actually make Header and Body of the control and correspond to respective Header and Body Panels of the control. Regards Khalid

i just reread your OP, it sounds like you've got a copy of the class referenced, not the same class. If you put the class in a dll which you ship to the client and the server then this should work. The code will owly have matching versions if it is the same dll on both client and server hth Russ