private void InitializeComponent()
        {
            AvaloniaXamlLoader.Load(this);

            DGV = this.FindControl <DataGrid>(nameof(DGV));
            DGV.SelectionChanged   += DGV_SelectionChanged;
            DGV.CellPointerPressed += DGV_CellPointerPressed;
            DGV.DoubleTapped       += (s, e) => DoubleClickEx?.Invoke(s, e);
            //---DGV.KeyDown            += DGV_KeyDown;

            #region comm.

            /*DGV.AddHandler(
             *  InputElement.PointerPressedEvent,
             *  (s, e) =>
             *  {
             *      var pp = e.GetCurrentPoint( null );
             *      Debug.WriteLine( $"PointerPressedEvent: {pp.Position}" );
             *      if ( pp.Properties.IsRightButtonPressed )
             *      {
             *          var coll = (e.Source as IControl)?.GetSelfAndVisualAncestors().OfType< DataGridColumnHeader >().FirstOrDefault();
             *          if ( coll != null )
             *          {
             *              e.Pointer.Capture( null );
             *              e.Handled = true;
             *          }
             *      }
             *  },
             *  handledEventsToo: true );
             */
            #endregion

            this.Styles.Add(GlobalStyles.Dark);
        }
 private void DGV_DoubleClick(object sender, EventArgs e) => DoubleClickEx?.Invoke(sender, e);