gtk:tree-view-column-pack-start (column renderer &key expand)

column -- a gtk:tree-view-column object
renderer -- a gtk:cell-renderer object
expand -- true, the default value, if the cell renderer is to be given extra space allocated to the tree view column

Packs the cell renderer into the beginning of the tree view column. If the expand argument is false, then the cell renderer is allocated no more space than it needs. Any unused space is divided evenly between cell renderers for which the expand value is true.