external filters configure

Hi how i can configure  - disable or enable filters for external filters ? 
i hideColumns but still see all filters. Is possible to setup filters what i need ? 

i push 

     $grid->setPermanentFilters(array(
            'date_create' => 'your_init_value1', // Use the default operator of the column
            'city' => array('from' => 'your_init_value1'), // Use the default operator of the column
            ));

and nothink change. How to use it ? i must manualy get all colimns 

$grid->getColumn('xxx')->setFilterable(false); ?