appbar OnUnableToAutoHide event
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Applies to
acAppBar component.  

property OnUnableToAutoHide: TNotifyEvent;  

The OnUnableToAutoHide event occurs when user trying to dock the "autohideable" AppBar (with AutoHide = True) to the screen edge where another hidden Application toolbar already docked. Unforunately, Windows can not dock more than one hidden AppBar per screen edge.  
tip When AppBar is unable to auto-hide, the AutoHide property becames False.  

See also
AutoHide property.