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");
}