Is there really no way to follow up dataset parent relation in xaml binding?

<stackpanel>   // with datacontext set from code to dataset.tables["ord"]
   <TextBox Text="{Binding Something}"/>
   <TextBox Text="{Binding Anotherthing}"/>
   <TextBox Text="{Binding ???}"/> // that's my problem, how to show related Emp.Name
</stackpanel>

<StackPanel>
    <StackPanel.Resources>
        <ObjectDataProvider x:Key="ds" ObjectType="{x:Type mynamespace:MyDataSet}" />
    </StackPanel.Resources>

    <!-- We set the data context to the collection of rows in the table -->
    <StackPanel DataContext="{Binding Source={StaticResource ds}, Path=USERS.Rows}">
        <ListBox ItemsSource="{Binding}"
                 DisplayMemberPath="NAME"
                 IsSynchronizedWithCurrentItem="True" />
        <TextBox Text="{Binding Path=NAME}"/>
        <TextBox Text="{Binding Path=COUNTRIESRow.NAME}"/>
    </StackPanel>
</StackPanel>

using System.Data;

public partial class OrdDataTable : DataTable
{
    public string EmpName
    {
        get { return this.EmpRow.Name; }
    }
}

<TextBox Text="{Binding NAME}"/> //shows correctly current user's name
<TextBox x:Name="tbC" Text="{Binding COUNTRIESRow.NAME}"/> //doesn't show related country name

tbC.Text = ds.USERS[0].COUNTRIESRow.NAME;

BindingExpression path error: 'COUNTRIESRow' property not found on 'object'  'USERSDataTable' (HashCode=6518513)'. BindingExpression:Path=COUNTRIESRow; DataItem='USERSDataTable' (HashCode=6518513); target element is 'TextBox' (Name='tbC'); target property is 'Text' (type 'String')

<StackPanel>
    <StackPanel.Resources>
        <ObjectDataProvider x:Key="ds" ObjectType="{x:Type mynamespace:MyDataSet}" />
    </StackPanel.Resources>

    <!-- Notice we set the data context to the first item in the array of tables -->
    <StackPanel DataContext="{Binding Source={StaticResource ds}, Path=USERS[0]}">
        <TextBox Text="{Binding NAME}"/>
        <TextBox Text="{Binding COUNTRIESRow.NAME}"/>
    </StackPanel>
</StackPanel>