David,

>I followed your advice and modified my control to use the mmToolStrip and mmToolStripButtons. Unfortunately I still receive the same "serialization" error message EXCEPT instead of saying "mmToolBarButton is not serializable", it now says "mmToolStripButton is not serializable".
>
>I also tried modifing my control to just use regular ToolStripButtons rather than the mmToolStripButtons and I get the same error message with ToolStripButton not serializable.
>
>These errors happen in the designer when I am dropping my control onto the form.
>
>I am basically just subclassing the mmToolStripNavigationControl and adding additional buttons to it. I can use the mmToolStripNavigationControl just fine.
>
>Any feedback or advice that anyone could give me would be greatly appreciated. The control works fine in VS2003.

Can you outline the steps you took to add buttons to the navigation toolbar subclass?

Best Regards,