$ajax->observeField not working

Hi,

i have a Problem with cake and his ajax

Follow Code is working very well (Target: $ajax->div('test')):

echo $ajax->link('Details','/regions/update_select',
array( 'url'=> array( 'controller' => 'regions', 'action'
=>'update_select' ),
'update'=>'test',
));

But the same code with a select field doesn't work:

echo $ajax->observeField('district_name',
array( 'url'=> array( 'controller' => 'regions', 'action'
=>'update_select' ),
'update'=>'test',
'onChange'=>true));

The response from the server is emty.
Hope somebody can help me :)
Thanks
Justin

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