many buttons, one handler with gtkbuilder

["Peter F. Patel-Schneider" <pfps verizon net>]

Hi:

I have an application where I have many buttons (20-30) that all do the 
almost "same" thing.  I would like to have this done without having to 
have different handlers for each button.
It seems to me that the easiest way to do this is to have "user-data" on 
each button widget that differentiates between the different buttons.  
However, I can't figure out how to do this easily, even when 
post-processing the .ui file.
Does anyone know how to get gtkbuilder (and/or glade) to put such 
differentiating data into button widgets?  It seems like such an obvious 
thing to do.
Peter F. Patel-Schneider