code: func (v *TreeView) SetModel(model ITreeModel) {
  	var mptr *C.GtkTreeModel
  	if model != nil {
  		mptr = model.toTreeModel()
  	}
  	C.gtk_tree_view_set_model(v.native(), mptr)
  }
docs: // SetModel is a wrapper around gtk_tree_view_set_model().