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Created attachment 14589 [details]
On WinRT, a ListView who's ItemSource is a collection of collections is not updating its UI when items are added to the inner collection. However, the UI reflects when the inner collection is cleared or items are removed.
### Steps to Reproduce
1. From the attached repro solution, run the Windows Phone 8.1 project
2. Toggle the switch on the page
### Expected Results
When the switch is toggled on, the items under "Group C" are removed. Toggling the switch off will re-add the items. You can run any of the platform project to see these results.
### Actual Results
When the switch is on, the items are removed as expected. However, when it is toggled off, the items do not re-appear in the UI even though through debugging you can verify that the items do exist in the collection.
### Environment Info
Tested using Forms 2.0.1-pre1. Only WinRT has this issue.
Microsoft Visual Studio Professional 2015
Version 14.0.24720.00 Update 1
Microsoft .NET Framework
Installed Version: Professional
Visual Basic 2015 00322-40000-00000-AA362
Microsoft Visual Basic 2015
Visual C# 2015 00322-40000-00000-AA362
Microsoft Visual C# 2015
Visual C++ 2015 00322-40000-00000-AA362
Microsoft Visual C++ 2015
Windows Phone SDK 8.0 - ENU 00322-40000-00000-AA362
Windows Phone SDK 8.0 - ENU
Application Insights Tools for Visual Studio Package 1.0
Application Insights Tools for Visual Studio
ASP.NET and Web Tools 2015.1 (Beta8) 14.1.11106.0
ASP.NET and Web Tools 2015.1 (Beta8)
ASP.NET Web Frameworks and Tools 2012.2 4.1.41102.0
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ASP.NET Web Frameworks and Tools 2013 5.2.30624.0
For additional information, visit http://www.asp.net/
Common Azure Tools 1.5
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
A Visual Studio Extension that brings the GitHub Flow into Visual Studio.
Microsoft Azure Mobile Services Tools 1.4
Microsoft Azure Mobile Services Tools
NuGet Package Manager 3.3.0
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PreEmptive Analytics Visualizer 1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.
SQL Server Data Tools 14.0.50616.0
Microsoft SQL Server Data Tools
TypeScript for Microsoft Visual Studio
Visual Studio Tools for Universal Windows Apps 14.0.24720.00
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Xamarin 188.8.131.527 (1390b70)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 184.108.40.206 (d300845)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.iOS 220.127.116.11 (ea30b32)
Visual Studio extension to enable development for Xamarin.iOS.