ActiveSelect overrights default value

Code sample
$fname = 'fieldname';
$form[$fname . 'prop' ] = array ( '#type' => 'select' ,'#default_value' => array($field['widget']['propname']), '#disabled'=>false, '#options' => $prop , '#title' => 'Via link type') ;
$form[$fname .'prop']['#type'] = 'activeselect';
$form[$fname .'prop']['#activeselect_path'] = 'activeselect';
$form[$fname .'prop']['#activeselect_targets'] = $fname. 'range';
$form[$fname .'prop']['#activeselect_extra'] = '';
$form [$fname .'range' ] = array ( '#type' => 'select' , '#options' => $nodes , '#default_value' => $value,'#title' => "Target page" ) ;

When this loads with javascript disabled it works, however, when it loads with javascript enabled, it over rights the default value of the range item, because the prop causes the activeselect ajax to fire.

Is there a way to pass the default_value into the ajax call, so that it can write it back out again?