protected override void OnNavigatedTo(NavigationEventArgs e) { if (((TabPageInfo)e.Parameter).Title is string && !string.IsNullOrWhiteSpace(((TabPageInfo)e.Parameter).Title)) { var info = ((TabPageInfo)e.Parameter); ViewModel.Windows_ID = info.Window_ID; ViewModel.ID = info.ID; ViewModel.SetSource(new Uri(info.Url)); } else { // } base.OnNavigatedTo(e); }