public void ProcessCmdKey(Keys2 keyData)
        {
            switch (keyData)
            {
            case Keys2.Control | Keys2.A:
                GraphModel.SelectAllNodes();
                GraphModel.FireSelectionChange(true, 0);
                control.Invalidate(true);
                break;

            case Keys2.Up:
                GraphModel.MoveUp(5);
                control.Invalidate(true);
                break;

            case Keys2.Down:
                GraphModel.MoveDown(5);
                control.Invalidate(true);
                break;

            case Keys2.Left:
                GraphModel.MoveLeft(5);
                control.Invalidate(true);
                break;

            case Keys2.Right:
                GraphModel.MoveRight(5);
                control.Invalidate(true);
                break;
            }
        }