public VmTestQuestionContent(VmPopupHostingPage vmPopupHostingPage, int index)
 {
     Index = index;
     this.vmPopupHostingPage = vmPopupHostingPage;
     SelectedAnswers = new ObservableCollection<object>();
     CommandShowImage = new RelayCommand(ShowImage);
 }
 public VmQuestionContent(VmPopupHostingPage vmPopupHostingPage)
 {
     this.vmPopupHostingPage = vmPopupHostingPage;
     SelectedAnswers = new ObservableCollection<object>();
     SelectedAnswers.CollectionChanged += SelectedAnswers_CollectionChanged;
     CommandShowImage = new RelayCommand(ShowImage);
 }