Symptom: Select the "Syntax.CD.Dylan" item without moving into it's
submenu. Now, move straight down into the main Vim text area (outside
of all shown menu item popups) and release the mouse button. An Xt
Warning is printed.
Fix: Popdown the submenus from the deepest levels up, instead of
top-down like it was before.
NOTE: This is neccessary due to the fact that an XtPopdown() call
automatically removes grabs for all children of the widget, therefore
subsequently calling XtPopdown() on children will produce the Xt Warning
David Harrison Jr.