public void SetModel(Model model)
 {
     this.model = model;
     Return = new MvvmCommand(() => Pages.ChangePageTo(PageType.StudentList), () => true);
     Random = new MvvmCommand( () => 
 }
 void PageContainer_CurrentPageChanged(object sender, PageType e)
 {
     CurrentPage = Pages.GetPageByType(e);
     NotifyPropertyChanged("CurrentPage");
 }