OnStartDock event dispatcher.
procedure DoStartDock(var DragObject: TDragObject); override;
virtual __fastcall DoStartDock(TDragObject DragObject);
DoStartDock calls any event handler attached to the OnStartDock event. When creating a component that descends from TControl, override DoStartDock to provide other responses in addition to the inherited event-handler call when the user starts a drag-and-dock operation.
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