private void MasterDetailViewControl_Loaded(object sender, RoutedEventArgs e)
{
this.Unloaded += MasterDetailViewControl_Unloaded;
this.DataContextChanged += MasterDetailViewControl_DataContextChanged;
navigationManager = SystemNavigationManager.GetForCurrentView();
//navigationManager.BackRequested += NavigationManager_BackRequested;
Window.Current.SizeChanged += Current_SizeChanged;
EvaluateLayout();
}