Update MasterDetailsView.cs (#1341)
Update MasterDetailsView.cs (#1341)

The sample Master Details View doesn't work with the Incremental Loading Collection.
Master Details View: https://github.com/Windows-XAML/Template10/blob/3bc941c314f5d092c5b1b666b9e5c66c2354f33a/Samples/MasterDetail/Controls/MasterDetailsView.cs 
Incremental Loading Collection: https://github.com/Microsoft/UWPCommunityToolkit/blob/dev/Microsoft.Toolkit.Uwp.UI.Controls/MasterDetailsView/MasterDetailsView.cs

Solution is to add base.OnApplyTemplate() to the override of the OnApplyTemplate function. This will add some neccesary binding events.
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