How to add different Description for every Checkbox in Zend MultiCheckbox Class

How to add different Description for every Checkbox in Z开发者_如何学编程end MultiCheckbox Class

Thanks

  $this->addElement('MultiCheckbox', 'multicheck', array(
   'label'=>'Checkboxes',
   'multiOptions'=>array(1=>'Label 1', 2=>'Label 2')
  ));