appbar OnActivate event
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Applies to
acAppBar and acAppEvents components.  

property OnActivate: TNotifyEvent;  

The OnActivate event for an appbar occurs when the appbar becomes active (i.e. when user clicks the client area with a mouse). Your appbar becomes active when it is initially run or when focus is shifted from another form or Windows application to your form (AppBar).  

See also
OnDeactivate event.