Sending radio button value through auto_complete

I’ve got an autocomplete field
text_field_with_auto_complete(:query, :text, {}, :skip_style =>
true, :tokens => “,”)
and some radio buttons in the same form :
radio_button_tag(:domain, “product”, :checked => true)
radio_button_tag(:domain, “user”)

but in my controller function “auto_complete_for_query_text” i don’t
know how to take radio buttons values.
someone can help me?

Regards.