ext.net gridpanel foreign key filter

Question

my doubt is very simple, I just wanna show a name of User instead a ID. I did this before inside a Combobox, but now, I don't need to select. Just show the name. So, I should put a store inside Column? Id_usuario is the foreign key.

<ext:Column
     runat="server"
     DataIndex="id_usuario"
     Text="Responsável"
     Flex="2"
     Align="Center">
         //Here I want put a Store.
</ext:Column>