private IFastGridCell GetCell(FastGridCellAddress addr) { if (addr.IsCell) { return(GetCell(addr.Row.Value, addr.Column.Value)); } if (addr.IsRowHeader) { return(GetRowHeader(addr.Row.Value)); } if (addr.IsColumnHeader) { return(GetColumnHeader(addr.Column.Value)); } if (addr.IsGridHeader && _model != null) { return(_model.GetGridHeader(this)); } return(null); }