+ 20 'Submenu pointer' from menu item
+ 24 x coord of top left new submenu
+ 28 y coord of top left new submenu
+ 32 Selection list (as in MenuSelection)
You receive this message when pointer moves over the submenu arrow in a menu entry with the 'generate message' bit set.
You can use the 'submenu pointer' and/or the selection list, to decide which window or menu to open with Wimp_CreateSubMenu. The submenu you actually open doesn't have to be the same as the one passed to you at +20. However, if you wish the submenu to be re-opened when the Wimp recreates the menu you should store the new handle at +20.
See PRM 3, page 239.
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