Hi,   I am trying to set the card view theme to Detailconfiguration tag. It is throwing error as ''{markup:ThemeKey TargetViewType=xcdg:CardView, ThemeType=xcdg:AeroNormalColorTheme, TargetElementType=xcdg:DataRow}' value is not a valid MarkupExtension expression. Cannot resolve 'ThemeKey' in namespace ...

I have an ObservableCollection one of whose member properties is an ObservableCollection. I can get the first level to display correctly, but haven't much idea on how to get the nested collection working. I have tried setting up the DataRelationDetailDescription and DetailConfiguration tags but I don't see where the binding to the nested ...

<Grid xmlns:xcdg=''http://schemas.xceed.com/wpf/xaml/datagrid''><Grid.Resources>  <xcdg:DataGridCollectionViewSource ...