Rails - Mar 2007 - observe(ing)_fild a collection_select with 1 item

Hi there
I''m obseving a field (a collection select) and it work if the
collection has more than one item, if it has only one it wont change
anything here is my code

<%= collection_select ''address'',
''address'', @addresses, :id, :address %></p>
<%= observe_field(
              :address_address,
              :update => ''shipping'',
              :url => { :action => :shi },
              :complete => "new
Effect.SlideDown(''shipping'')",
              :with => ''boo'')  %>

As I read that obseve_fields take the same arguments of link_to_remote
i have tried :on => click
focus
change
but no luck
if there is only one item in the collection it wont work

thanks in advance
--
Jorge Mario G. Mazo

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