GtkTreeViewColumn::cell_set_cell_data
void cell_set_cell_data(GtkTreeModel tree_model, GtkTreeIter iter, bool is_expander, bool is_expanded);
Sets the cell renderer based on the tree_model and iter. That is, for every attribute mapping in tree_column, it will get a value from the set column on the iter, and use that value to set the attribute on the cell renderer. This is used primarily by the GtkTreeView.