>The working core of my database consists of a class generated form with a grid along with its associated toolbar(s) and ... its own menu. By replacing the default system menu, I lose all sorts of useful functions - including ctrl+c to copy and ctrl+v to paste. The mouse still works. Can anyone tell me how to re-instate these essential functions while I'm editing data in my grid.... MANY THANK YOU-s in advance.

Create a dummy menu [regular menu, not a shortcut menu]. Under the Menu pad, click Quick Menu. All the menu bars under Edit are what you need to add to your menu to have this functionality.