I made a class that contains a 3 page pageframe and each page has a grid on it. I then placed this class on a form. Later I decided I needed another column in one of the grids so I went to the class, modified the grid and saved it. When I then tried to bring up the form with that class on it I get an error loading the form that says "...Parent: Cannot add this object to a grid." What basic rule of subclassing have I violated here? Is there a way to hack a solution or am I stuck?