Handles dragging of the control over an invalid docking target.
procedure DockTrackNoTarget(Source: TDragDockObject; X: Integer; Y: Integer); dynamic;
__fastcall DockTrackNoTarget(TDragDockObject Source, int X, int Y);
DockTrackNoTarget is called automatically when the control is dragged over an invalid docking target. It updates the docking rectangle of the TDragDockObject specified by Source to reflect the current mouse coordinates, as given by X and Y.
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