Toolbar button in just one file

Is there someone who can tell me if there is a way to make a toolbar button in just one file.
I make toolbar buttons and they are available in each file I open. Sometimes I want a very special button in just one specific file.

Sorry for my bad English

Hi Frits - you can create a toolbar file with only one toolbar and one button, and open that file when you have the relvant 3dm file open, but toolbars are not associated with the Rhino document, so you’ll need to manage that yourself.

-Pascal

Hi Pascal.
Tnx for the fast answere.
It is clear to me.