public ROSApp ShowApp(ROSApp app)
    {
        if (app.IsSingleton())
        {
            if (openSingletonApps.ContainsKey(app.GetType()))
            {
                ROSApp singletonApp = openSingletonApps[app.GetType()];
                singletonApp.Open();
                return(singletonApp);
            }
            else
            {
                // move to display area (to make sure we don't duplicate
                app.transform.SetParent(appDisplayArea, true);
                app.Open();
                openSingletonApps.Add(app.GetType(), app);
                return(app);
            }
        }

        // duplicate gameobject and put under working area
        GameObject appObj = Instantiate(app.gameObject, appDisplayArea);
        ROSApp     newApp = appObj.GetComponent <ROSApp>();

        newApp.Open();
        return(newApp);
    }
 /// <summary>
 /// Called from ROSApp no matter how the app is closed
 /// </summary>
 /// <param name="app"></param>
 public void AppClosed(ROSApp app)
 {
     if (app.IsSingleton() && openSingletonApps.ContainsKey(app.GetType()))
     {
         openSingletonApps.Remove(app.GetType());
         app.transform.SetParent(appBuildArea, true);
     }
 }