GridTableView call codebehind function

[NS]

Hello,
In a typical grid I would declare a column like this to call a codebehind function. (eg pass a string, and return a color trough a codebehind function)

<telerik:GridTemplateColumn ItemStyle-Width="15px" HeaderText="Workflow Status">
                                            <ItemTemplate>
                                                <asp:Label ID="Label1" runat="server" Width="15px" BackColor='<%# translateColor(Eval("K2Status").ToString()) %>' />
                                            </ItemTemplate>
                                           </telerik:GridTemplateColumn>

I want to do something similar in a nested grid. (using GridTableView),
However, If I do this, I get an "object reference not set error" on the label where I try to call the codebehind functon.

Any ideas how to solve this ?
Thanks,
Nicolas

[NS]

I solved it myself. This actually also works on a GridTableView. My problem was that there was an element missing in my object.