If you mean adding your own objects from a class library to a standard form you can add a new class library to the tool bar and drop your classes on the form like the standard ones. If you mean your forms are custom classes then you should just do the whole thing in code. It seems trickier at first but when I got used to it I found doing the whole thing in a PRG file is actually really easy because all that mouse clicking in the visual designers basically slows you down.