SourceGrid.GridVirtual.OnMouseDown C# (CSharp) Method

        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);

            //verifico che l'eventuale edit sia terminato altrimenti esco
            if (Selection.ActivePosition.IsEmpty() == false)
            {
                CellContext focusCell = new CellContext(this, Selection.ActivePosition);
                if (focusCell.Cell != null && focusCell.IsEditing())
                {
                    if (focusCell.EndEdit(false) == false)
                        return;
                }
            }

            //scateno eventi di MouseDown
            Position position = PositionAtPoint(new Point(e.X, e.Y));
            if (position.IsEmpty() == false)
            {
                Cells.ICellVirtual cellMouseDown = GetCell(position);
                if (cellMouseDown != null)
                {
                    ChangeMouseDownCell(position, position);

                    //Cell.OnMouseDown
                    CellContext cellContext = new CellContext(this, position, cellMouseDown);
                    Controller.OnMouseDown(cellContext, e);
                }
            }
            else
                ChangeMouseDownCell(Position.Empty, Position.Empty);
        }