>Could you please expand your idea? We have an Edit menu with the standard behavior for Ctrl+A, Ctrl+C, Ctrl+V, etc. I was thinking (now I'm not so sure), that it could be a good idea to select all items in the listbox in one particular form by Ctrl+A. How can I do it, if you think, it's a good idea?

Like I said, try using a menu option with this hot key, and pass the action onto the active form. I don't have time to create sample project files for you, but if there is a specific question on my suggestion, I'd be happy to answer it.