 need to tell all three observers that they should provide hints for the actions we want to observer widgets displaying them
ObserverHints::DisplayFlags display_flags = 0;
display_flags |= ObserverHints::ItemView;
display_flags |= ObserverHints::NavigationBar;
display_flags |= ObserverHints::PropertyBrowser;
display_flags |= ObserverHints::ActionToolBar;
observer_widget->activeHints()->setDisplayFlagsHint(display_flags);

// Before the observer widget initialization we can specify where the editor should be