Getting The Fixed Size Control?

I have subclassed a control that would be vastly better if it was a certain size. At first, I thought I could simply set the height and width in the constructor. That would annoy people, as the control would be placed on the form at some size, and the size would then shift when the program starts, but it doesn't work anyways because the control constructor is called before the size properties are applied to it. Is there a way to fix the size of a control at design time? The only controls that I can think of that don't have the ability to be sized are pretty highly specialized.