can you help me how to use CakePHP's displayField directive, I can not figure out how to use it...

so, in a model file, i have following code...

&lt;?php


class Task extends AppModel {

var $name = 'Task';
var $displayField = 'projectName';

//The Associations below have been created with all possible keys, those that are not needed can be removed
var $belongsTo = array(
    'User' =&gt; array(
        'className' =&gt; 'User',
        'foreignKey' =&gt; 'user_id',
        'conditions' =&gt; '',
        'fields' =&gt; '',
        'order' =&gt; ''


etc...

how can i use this, to display fied projectName in select form field?

thank you in advance!!!


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