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how do i remove white background in node inside virtual TVirtualStringTree?

Last Modified: 2016-04-07
i am currently try to remove node background white color i try to use TargetCanvas.Brush.Style := bsClear; inside BeforeCellPaint event but the white background of node still visible how do i remove that white back ground color of node ? here what i tried

procedure TForm2.VTs1BeforeCellPaint(Sender: TBaseVirtualTree;   TargetCanvas: TCanvas; Node: PVirtualNode; Column: TColumnIndex;   CellPaintMode: TVTCellPaintMode; CellRect: TRect; var ContentRect: TRect); 
var Data: PUData;
 Data := VTS1.GetNodeData(Node);
  if not Assigned(Node) then Exit;
 TargetCanvas.Brush.Style := bsClear;

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