gtkTreeViewColumnCellSetCellData: gtkTreeViewColumnCellSetCellData
In RGtk2: R Bindings for Gtk 2.8.0 and Above

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.

1 2	gtkTreeViewColumnCellSetCellData(object, tree.model, iter, is.expander, is.expanded)

`object`	A `GtkTreeViewColumn`.
`tree.model`	The `GtkTreeModel` to to get the cell renderers attributes from.
`iter`	The `GtkTreeIter` to to get the cell renderer's attributes from.
`is.expander`	`TRUE`, if the row has children
`is.expanded`	`TRUE`, if the row has visible children