Fix crash in Windows.UI.Xaml.Controls.Primitives.Selector.put_SelectedIndex

[OpportunityLiu]

Version: 2016.8.25.0 | ExViewer

Stacktrace

Windows.UI.Xaml.Controls.Primitives.Selector;put_SelectedIndex;;
ExViewer.Views.ImagePage;b__16_1;;
System.Runtime.CompilerServices.TaskAwaiter;ThrowForNonSuccess;;
System.Runtime.CompilerServices.TaskAwaiter;HandleNonSuccessAndDebuggerNotification;;
System.Runtime.CompilerServices.TaskAwaiter;GetResult;;
ExViewer.Views.ImagePage.<b__16_0>d;MoveNext;;
System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c;b__6_0;;
System.Threading.WinRTSynchronizationContext.Invoker;InvokeCore;;
Windows.ApplicationModel.Core.UnhandledError;Propagate;;
Microsoft.HockeyApp.Extensibility.Windows.UnhandledExceptionTelemetryModule;CoreApplication_UnhandledErrorDetected;;

Reason

Value does not fall within the expected range.

Link to HockeyApp

• https://rink.hockeyapp.net/manage/apps/339042/crash_reasons/136739115