




The function pane-has-focus-p is the predicate for whether 
pane
 currently has the input focus.
On Motif, pane-has-focus-p cannot be used in menu functions such as the 
enabled-function
 or 
popup-callback
 of a menu item. It will always return nil, because the focus is on the menu button when the user clicks on it.
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017