Link to domaindatasource one in a Row Master and other in the Row Detail

[GG]

Hello,

I made a Row Detail Template the Row Master is a RadGridView and the Row Detail is another one RadGridView. The two RadGridView have their ItemsSource property bind to two different RadDomainSource. (I understand it is not the better way to use the Row Master/Detail Template but it seems it is my only solution.)
The problem is the inner RadGridView get its ItemsSource from a column of the Parent RadGridView's Row.
I show you a bit of code:

The DomainDatasource :

<telerik:RadDomainDataSource
    Name="ddsPeopleMaster"
    x:Key="resPeopleMaster"
    QueryName="GetTabPeopleMasterQuery"
    AutoLoad="True">
    <telerik:RadDomainDataSource.QueryParameters>
        <telerik:QueryParameter ParameterName="myId" Value="{Binding myId}" >
        </telerik:QueryParameter>
    </telerik:RadDomainDataSource.QueryParameters>
    <telerik:RadDomainDataSource.DomainContext>
        <local:BID_RegisterContext />
    </telerik:RadDomainDataSource.DomainContext>
</telerik:RadDomainDataSource>
<telerik:RadDomainDataSource
    Name="ddsPeopleDetail"
    x:Key="resPeopleDetail"
    QueryName="GetTabPeopleDetailQuery"
    AutoLoad="True">
    <telerik:RadDomainDataSource.QueryParameters>
        <telerik:QueryParameter ParameterName="myId" Value="{Binding myId}" />
        <!-- LOOK THIS LINE -->
        <telerik:QueryParameter ParameterName="PeopleId" Value="{Binding People_Id, ElementName=gdPeopleMaster}" />
        <!-- LOOK THIS LINE -->
    </telerik:RadDomainDataSource.QueryParameters>
    <telerik:RadDomainDataSource.DomainContext>
        <local:BID_RegisterContext />
    </telerik:RadDomainDataSource.DomainContext>
</telerik:RadDomainDataSource>

The RadGridView :

<telerik:RadGridView
    Name="gdPeopleMaster"
    AutoGenerateColumns="False"
    ItemsSource="{Binding DataView, Source={StaticResource resPeopleMaster}}">
    <telerik:RadGridView.Columns>
        <!-- Toggle -->
        <telerik:GridViewToggleRowDetailsColumn />
        <!-- People Name -->
        <telerik:GridViewDataColumn
            Header="People Name"
            DataMemberBinding="{Binding People_Name}">
        </telerik:GridViewDataColumn>
        </telerik:GridViewDataColumn>
    </telerik:RadGridView.Columns>
    <telerik:RadGridView.RowDetailsTemplate>
        <DataTemplate>
            <telerik:RadGridView
                x:Name="gdPeopleDetail"
                AutoGenerateColumns="True"
                ItemsSource="{Binding DataView, Source={StaticResource resPeopleDetail}}">
            </telerik:RadGridView>
        </DataTemplate>
    </telerik:RadGridView.RowDetailsTemplate>
</telerik:RadGridView>

I have commented the line where I have a problem.