When using nested FieldLayouts inside a XamDataGrid, is it possible to use different styling for the parent layout and the nested layout?

Given the structure of the xaml, I'm not sure how I'd accomplish this.  The xaml structure of my window is below.

Can I style the two FieldLayouts?  The Fields?  A snippet of example code would be really helpful.

<igDP:XamDataGrid Name="grid" Style="{StaticResource DefaultGrid}">

        <igDP:XamDataGrid.FieldLayouts>

                <igDP:FieldLayout Key="myParentRow">

                        <igDP:FieldLayout.Fields>

                                <igDP:Field Name="Name"/>

                                <igDP:Field Name="DetailRows" Visibility="Hidden"/>

                        </igDP:FieldLayout.Fields>

                </igDP:FieldLayout>

                <!-- Can I style this sub-grid differently than myParentRow above? -->

                <igDP:FieldLayout ParentFieldLayoutKey="myParentRow">

                        <igDP:FieldLayout.Fields>

                                <igDP:Field Name="Foo"/>

                                <igDP:Field Name="Bar"/>

                        </igDP:FieldLayout.Fields>

                </igDP:FieldLayout>

        </igDP:XamDataGrid.FieldLayouts>

</igDP:XamDataGrid>