diagramtoolbar - Have I clicked on a button?

Hi Walter and Bruno

 
I want to know if a user has simply clicked on a button in the diagramtoolbar. There are no onclicks or mousedown options - Help!
 
I can then use this information for a pop up or something - like telling them to click on the diagram...
 
Thanks

Unfortunately there is no such feature in the TDiagramTool bar control...