code: func (v *TreeSelection) GetSelected() (model ITreeModel, iter *TreeIter, ok bool) {
  	var cmodel *C.GtkTreeModel
  	var citer C.GtkTreeIter
  	c := C.gtk_tree_selection_get_selected(v.native(),
  		&cmodel, &citer)
  	model = wrapTreeModel(glib.Take(unsafe.Pointer(cmodel)))
  	iter = &TreeIter{citer}
  	ok = gobool(c)
  	return
  }
docs: // GetSelected() is a wrapper around gtk_tree_selection_get_selected().