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'filter' => CHtml::DropDownList( 'Loading[culture_id][]', 
  $_GET['Loading']['culture_id'],
  CHtml::listData(Loading::model()->with('culture')
                  ->findAll(array(
                    "condition"=>"culture_id IS NOT NULL",
                    'order'=>'culture.name'
                  )), 
    'culture_id','culture.name'),
  array('multiple'=>true,'checkAll'=>'Всi','class'=>'multipleselect') 
),