public virtual void ExecuteQuitCoreGame(QuitCoreGameCommand command)
 {
     command.Sender = CoreGameRoot;
     CoreGameRoot.QuitCoreGame.OnNext(command);
 }
 public virtual void QuitCoreGameHandler(QuitCoreGameCommand command)
 {
     this.QuitCoreGame(command.Sender as CoreGameRootViewModel);
 }