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I have 3 tables: Item - which is the DataContext - it has a navigation column Group Group - has a navigation column Category. I want to have in the DataGrid both (Category & Group) columns and when I choose a category it should display in the group col only the Category.Groups. Here is the code I am working on: <tk:DataGrid AutoGenerateColumns="False" ItemsSource="{Binding}"> <tk:DataGrid.Columns>  <tk:DataGridComboBoxColumn Header="Categroy" DisplayMemberPath="Title" SelectedValuePath="CategoryId" SelectedValueBinding="{Binding Group.Category.CategoryId}" ItemsSource="{Binding Context.Categories, Source={x:Static Application.Current}}" />   <tk:DataGridTemplateColumn> <tk:DataGridTemplateColumn.CellTemplate> <DataTemplate> <ItemsControl ItemsSource="{Binding Group.Category.Groups}"> <ItemsControl.ItemTemplate> <DataTemplate DataType="{x:Type data:Group}"> <TextBlock Text="{Binding Title}"/> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> </DataTemplate> </tk:DataGridTemplateColumn.CellTemplate> </tk:DataGridTemplateColumn>   <tk:DataGridComboBoxColumn Header="Group" DisplayMemberPath="Title"

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