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