I'm having problem with my filter header on grids that loads ModelFiled with type object, that means when I have an object as an Index and render the columnsvalues with javascript Render Handler and then try to filter in the grid with these columns the filter dose not work. Any idea to fix this?

<ext:Store ID="id">
    <Model><ext:ModelField Name="Endpoints" Type="Object" /></Model>
</ext:store>
<ColumnModel ID="ColumnModel_Users" runat="server">
    <Columns>
        <ext:Column ID="ColumnEndpointName" runat="server" DataIndex="Endpoints" Text="EndpointName">                                               <Renderer Handler="return value.EndpointName" />
        </ext:Column>
    </Columns>
</ColumnModel>