public MainVM()
{
model = new Model();
PageContainer.SetModel(model);
CurrentPage = PageContainer.GetPageByType(PageType.StudentList);
PageContainer.CurrentPageChanged += PageContainer_CurrentPageChanged;
OpenGroupList = new MvvmCommand(() => PageContainer.ChangePageTo(PageType.GroupList), () => true);
OpenStudentList = new MvvmCommand(() => PageContainer.ChangePageTo(PageType.StudentList), () => true);
}
void PageContainer_CurrentPageChanged(object sender, PageType e)
{
CurrentPage = PageContainer.GetPageByType(e);
NotifyPropertyChanged("CurrentPage");
}