Zend_Form - add CSS Class :: How can I add css class to label in Zend_Form?

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How can I add css class to label in Zend_Form?This is html way:\[code\]<dt><label for="foo" class="label-design">Foo</label></dt>\[/code\]How can I write above row with Zend_Form?(I know how to write label but i dont know how can i add ccss class.\[code\]$model = new Zend_Form_Element_Text('model');$model->setLabel('Model');\[/code\])Thanks,