addition to @ramamoorthy_villi answer
to create a dropdown list, simply use CHtml s dropdownList() function, then you can have your dropdown filled with your own data,
$data = array(
'selected_value' => 'defaultController/action',
'2' => 'controller2/action',
'3' => 'controller3/action',
)
echo CHtml::dropdownList('Name' , 'selected_value' , $data);
now you have it with defaultController/action
pre selected