onClick() Event for Radio button

Hi All,

How to add onClick event for Radio button? I have tried and it shows 'Object does not support menthod" error.

var myRadioButtonGroup = radiobuttonGroups.add();

                                     with(myRadioButtonGroup)

                                     {

                                        var CoverPages = radiobuttonControls.add({staticLabel:"Cover Pages"});   

                                         CoverPages.onClick=function(){$.writeln("Test");};

                                        var PrelimPages = radiobuttonControls.add({staticLabel:"Prelim Pages"});

                                        var CroppedEdboardPages = radiobuttonControls.add({staticLabel:"Cropped Edboard Pages"});

                                        var ExtraPages = radiobuttonControls.add({staticLabel:"Extra Pages"});

                                     }        

Regards,

SASE