gtk/gtk.go
func (v *TreeSelection) SetMode(m SelectionMode) {
	C.gtk_tree_selection_set_mode(v.native(), C.GtkSelectionMode(m))
}
func (v *TreeSelection) SetMode(m SelectionMode) {
	C.gtk_tree_selection_set_mode(v.native(), C.GtkSelectionMode(m))
}
// SetMode() is a wrapper around gtk_tree_selection_set_mode().