// add "Show In" actions...
final RelatedViewActionGroup viewMenu = new RelatedViewActionGroup(getEditDomain());
context = new ActionContext(_viewer.getSelection());
viewMenu.setContext(context);
viewMenu.fillContextMenu(menuMgr1);
// add extension point contributed menu actions
CustomedContextMenuActionGroup customedMenu = new CustomedContextMenuActionGroup();
customedMenu.setContext(new ActionContext(_viewer
.getSelection()));