The example that demonstrates NavBarControl within the MVVM pattern (E3541) does not work properly

I'm trying to bind my NavBarControl to my ViewModel with a IList. I've found the documentation for a DataTable, but I don't want to use a DataTable and I can't find anything on List/Collection.
My problem is that I can't get any of the NavBarItems to populate under the groups. Not sure if I'm not binding it right or I need to change my IList.
        <dxn:NavBarControl HorizontalAlignment="Left" Name="navBarControl1" VerticalAlignment="Top" Height="300" Width="300"
                           ItemsSource="{Binding Path=NavigationBarContent}" GroupDescription="DisplayName">
            <dxn:NavBarControl.Resources>
                <Style TargetType="{x:Type dxn:NavBarGroup}">
                    <Setter Property="Header" Value="{Binding}"/>
                </Style>
                <Style TargetType="{x:Type dxn:NavBarItem}">
                    <Setter Property="Content" Value="{Binding}"/><!--Didn't know what to put here, so it just binds the groups name-->
                </Style>
            </dxn:NavBarControl.Resources>
        </dxn:NavBarControl>