how to uppercase only first in zend form inputs?

I am working with Zend Form, and on the edit i want the values to be like ucfirst(values) ;. I found filters 'filters' => array('StringToUpper') but they work on the hole input. Any idea ? Thanks

No such filter exists but it would be trivial to create your own:

 class My_Filter_StringUCFirst implements Zend_Filter_Interface {
     public function filter($value){
         return ucfirst($value);
     }
 }