How to add values to a custom Resource object in FIM

I am basically new to FIM. My apologies if I am asking a stupid question. We need to create a custom Identity Picker control(Multi Value selection) with  a 10 fixed values displayed in the control so we created a custom identity control and associated with the custom resource. We are not able to understand how to add the values to the custom resource in order to display them  in the picker control. Is populating the objects done only through Metaverse or is there any other way to display those 10 values in the picker control?