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  TRTreeView = class (TTreeview)
    private
    redirected : boolean;
   // procedure Click(sender: tobject); override;
    procedure WMRBUTTONUP(var Msg: TMessage); message WM_RBUTTONDOWN;
    procedure WMLBUTTONDOWN(var Msg: TMessage); message WM_LBUTTONDOWN;
  end;                    

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procedure TRTreeView.WMLBUTTONDOWN(var Msg: TMessage);;
var i :integer;
    p : tpoint;
    tgmsg : tagMSG;
begin
{    getcursorpos(p);
    tgmsg.hwnd :=handle;
    tgmsg.message := WM_LBUTTONDOWN;
    tgmsg.wParam := msg.Wparam;
    tgmsg.lParam :=msg.LParam;
    tgmsg.time := gettickcount;
    tgmsg.pt := p;           }
//    inherited click;
//    getmessage(tgMsg,handle,0,0);
//    DispatchMessage(tgMsg);
//    click;
    if redirected then
      for i := 1 to Items.Count do
      if Items.Item[i].Selected then begin
        tag := i;
        getcursorpos(p);
        form1.popupmenu1.Popup(p.x,p.y);
        exit;
      end;
    redirected := false;
end;


procedure TRTreeView.WMRBUTTONUP(var Msg: TMessage);
begin
   redirected := true;
   mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0);
   mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);
end;

procedure TForm1.FormShow(Sender: TObject);
begin
   showwindow(handle,SW_MAXIMIZE);
   treeview1 := TRTreeview.Create(Form1);
   treeview1.Parent := Tabsheet3;
   treeview1.Align := alclient;
end;