Propagate changed status to parent on instance button activation

issue11145
review389711002
(grafted from a5bef51d82770d58474ef858eaf83ef263b47b72)

--HG--
branch : 6.0

src/screen.js

@@ -1976,6 +1976,7 @@
                         return record.model.execute(attributes.name, [values],
                             this.context).then(function(changes) {
                             record.set_on_change(changes);
+                            record.group.changed();
                             record.group.root_group.screens.forEach(
                                 function(screen) {
                                     screen.display();