void OnCellEditBegin(object sender, DataGridViewCellCancelEventArgs e)
        {
            m_NeedsSaving = true;

            
            CellEditInfo action = new CellEditInfo();

            action.ColIndex = e.ColumnIndex;
            action.RowIndex = e.RowIndex;

            if (dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value != null)
            {
                action.Value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
            }
            else action.Value = "";

            m_ColumnActions.Push(action);

        }