I'm having a problem with a custom control I designed. If the user modifies properties of the control via the VB Property window, VB properly fires the control's WriteProperties event. But if the user modifes the control using the Property Page I designed for it, then VB never calls the WriteProperties event. The control does update properly on the form, but if you close the form and reopen it, the changes to the control are gone (since they weren't saved). The changes do get saved if, after using the property page, the user modifes a property via the VB Property window. So I know the control is being updated, it's just that VB isn't firing the WriteProperties event if the only changes were through the Property Page.

What could I be doing wrong in the Property Page the would cause VB to not realize the control had changed?