/**                                                                             
 * This provides methods used for event handling. It's not meant to             
 * be used directly, except as a provider of related methods.                   
 *                                                                              
 * @mixin                                                                       
 */                                                                             
var Eventful = {
    /** fires something. */
    fires: function () {},
    /** handles a signal. */
    on: function () {}
};

/**                                                                             
 * @constructor
 * @mixes Eventful                                                              
 */                                                                             
var FormButton = function() {                                                   
};

/** @mixin AnotherMixin*/

/** I mix in multiple things
 * @constructor MyClass
 * @mixes Eventful
 * @mixes AnotherMixin */