Adds the cell to the end of cell_layout. If expand is FALSE, then the
cell is allocated no more space than it needs. Any unused space is
divided evenly between cells for which expand is TRUE.
Note that reusing the same cell renderer is not supported.
Since 2.4
Adds the cell to the end of cell_layout. If expand is FALSE, then the cell is allocated no more space than it needs. Any unused space is divided evenly between cells for which expand is TRUE. Note that reusing the same cell renderer is not supported. Since 2.4