The metadata for a focusable Grid cell.
Focusable Grid cells include headers, group headers and footers, and data cells.
The column index of the cell.
The column span for this cell (if set).
The data item for the parent row of this cell.
The data item index for the parent row of this cell.
The index of the row which contains this cell.
The row indexing is absolute and does not change with paging.
The row span for this cell (if set).