appbar OnDocked event
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Applies to
acAppBar component.  

  TacAppBarDockedEvent = procedure(Sender: TObject; NewPlacement: TacAppBarPlacementof object;  
property OnDocked: TacAppBarDockedEvent;  

The OnDocked event occurs when the form has been docked to the screen edge or has restored to normal, "floating" state. NewPlacement parameter shows new placement of the AppBar.  
tip To prevent docking to specific screen edge — use AllowedEdges property or OnDocking event.  

See also
AllowedEdges property and OnDocking, OnDockMove events.