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 gtk.TreeView
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 gtk.TreeView