Using a List<T> as a DetailTable

[Tyler]

Given the following object structure...

    public class CategoryViewModel
    {
            public int category_id {get; set;}

            public string category_name {get; set;}
            public List<CategoryDetailsViewModel> details { get; set; }
    }

    public class CategoryDetailsViewModel
    {
        public string category_detail_id {get; set;}

        public string category_admin {get; set;}
    }

 

Is it possible to use a DetailTable where the details are defined in the parent object? For example, I've tried this, though all the detail tables were empty:

    <telerik:RadGrid runat="server" ID="rgCategories" OnNeedDataSource="rgCategories_NeedDataSource" Skin="Silk" AutoGenerateColumns="false">
        <MasterTableView>
            <DetailTables>
                <telerik:GridTableView Name="Category Details">
                    <Columns>
                        <telerik:GridBoundColumn HeaderText="Category Admin" DataTextField="details.category_admin"></telerik:GridBoundColumn>
                    </Columns>
                </telerik:GridTableView>
            </DetailTables>
            <Columns>
                <telerik:GridBoundColumn HeaderText="Category" DataField="category_name"></telerik:GridBoundColumn>
            </Columns>
        </MasterTableView>
    </telerik:RadGrid>