Popup-mode-menu

hi developpers, After searching a while in mailing-lists I don't find any report about this problem. I'm using xemacs 21.4.6 with gtk widgets. I've a PC with the 'windows' extended keyboard, so there's a "menu" key. Using this key give me always the same message: "popup-mode-menu must be bound to a mouse or misc-user event" My question is: Is there something to do to get this menu key working as the mouse button 3 ? (like a popup menu appearing at text cursor position) Or is it a unknown bug (then thanks to me reporting it;-)) ? thanks for any help Olivier Samyn