private void InitializeDataStream() { dataStreamView = new DataStreamView(); dataStreamView.DataContext = AppPresenter.Inst.DSPresenter; AppPresenter.Inst.DSPresenter.BackHandler = () => { Dispatcher.BeginInvoke((Action)(() => { Content = menuView; })); }; AppPresenter.Inst.DSPresenter.ShowHandler = () => { Dispatcher.BeginInvoke((Action)(() => { Content = dataStreamView; })); }; }