Return a collectionviewsource with codebehind.

Hello, I'm trying to return a grouped observablecollection but all I get in my xaml is "MyProject.Model.KeyedList'2(|System.String.MyProject.model".
It doesn't seem to understand that it's data being sent.

app.xaml

 





 





myViewModel.xaml.cs

private CollectionViewSource catSorted; public ICollectionView CatSorted
{
get {

if (catSorted == null)

{

catSorted = new CollectionViewSource();

var GroupedCatsByDate = from c in cats.GetCats() group c by e.CatDate into groupedByDate

select new KeyedList(groupedByDate);

catSorted.Source = new ObservableCollection>(groupedByDate);

}

return catSorted.View; }

}