Thorgal,
You can customize run-time menus, but there is not a way to set information similar to tip and description for controls so that it will show up in the context help.
A possible workaround would be to remove the menu from the run-time VI (using File>>VI Properties>>Window Appearance), and provide all of your menu options on the front panel. Then, the description and tip you provide for these options would be available to you through the context help.
I hope this helps!
Liz Fausak
National Instruments
