Hi Android,

Unfortunately, the current behavior is the UserControl document designer
will add the UserControl derived classes into the "My User Controls"
category. And the ToolBoxItem always uses the "UserControl" bitmap. There
are no options to customize this behavior.

I'm not clear why you need customize this behavior? To my understanding,
this feature is mainly designed to help develop a UserControl, so you
needn't remove and re-add the usercontrol to the toolbox after rebuilding.
If you need use these UserControl in some other projects, you may create a
new category in the Toolbox and add the usercontrol by "Add/Remove Items..."
command, then the ToolboxItem, ToolboxBitmap ToolboxItemFilter attributes
should work in that case.

Does it answer your question?
Please feel free to reply this thread, if you have anything unclear about
this issue.

Have a nice day!

Best regards,

Ying-Shen Yu [MSFT]
Microsoft Community Support
Get Secure! - www.microsoft.com/security

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