Pop-up menu non-leaf selection

[straz@cambridge.apple.com (Steve Strassmann)]

 >Date: Mon, 29 Nov 1993 14:31:14 -0500
 >To: info-mcl@cambridge.apple.com
 >From: cfry@harlequin.com (Christopher Fry)
 >Subject: Pop-up menu non-leaf selection
 >
 >I've got a pop up menu with heirarchical menus.
 >I'd like to have an action run when the user releases the
 >mouse while it is over the title of a hierarchical menu.
 >
 >Advice greatly appreciated.

The user-interface gurus would probably suggest that the
friendliest thing would be to add leaf nodes as needed,
corresponding to whatever it is you mean by selecting
a hierarchical menu.

That would be unambiguous and obvious to users, and trivial
to implement as well.

See the "Macintosh Human Interface Guidelines" (pp 79-82)
By the way, this is an awesome book on good taste and
user interface etiquette. I'd highly recommend it even to
those not writing for the Macintosh!