=> R1 = pointer to submenu block, or window handle
R2,R3 = x,y coordinate of top-left of submenu.
<= R0 corrupt
This call is made when a MenuWarning message is received. This message is sent by Wimp when pointer is over the submenu arrow of a menu item with the Generate Message bit set in the item flags.
See PRM 3, page 199.
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