BetterExplorer.MainWindow.btnOpenWith_DropDownOpened C# (CSharp) Метод

    private void btnOpenWith_DropDownOpened(object sender, EventArgs e) {
      var mnu = new ShellContextMenu(this._ShellListView, false);

      var controlPos = btnOpenWith.TransformToAncestor(Application.Current.MainWindow).Transform(new WIN.Point(0, 0));
      var tempPoint = PointToScreen(new WIN.Point(controlPos.X, controlPos.Y));
      mnu.ShowContextMenu(new System.Drawing.Point((int)tempPoint.X, (int)tempPoint.Y + (int)btnOpenWith.ActualHeight), 1);
      btnOpenWith.IsDropDownOpen = false;
    }