remove_observer
remove_observer(this, entry->ref);
remove_observer(this, entry->ref);
remove_observer(this, panel->ref);
remove_observer(this, ref);
remove_observer(this, manager);
remove_observer(this, manager);
remove_observer(this, entry->ref);
remove_observer(this, entry->ref);
remove_observer(this, app->manager);
remove_observer(this, m_group);
status_t remove_observer(
status_t remove_observer(
status_t err = remove_observer(