Выделять узел TTreeView правой кнопкой мыши

procedure TForm1.TreeView1ContextPopup(Sender: TObject; MousePos: TPoint;
  var Handled: Boolean);
var
  tmpNode: TTreeNode;
begin
  tmpNode := (Sender as TTreeView).GetNodeAt(MousePos.X, MousePos.Y);
  if tmpNode <> nil then
    TTreeView(Sender).Selected := tmpNode;
end;