How can i disable the jquery UI dialog buttons like :

```
   $("#dialog").dialog({ width: 500, modal: true, show: 'drop', hide: 'drop',
        buttons: {
            "Next": function () {/* do something */ },
            "Finish" : function {/* do something */ } 
        }
    });

```

I want to keep `disabled the Next button` until user selects some `radio button or checkbox` and when user will select any of then `'Next button will enabled'`. (Same behavior which we can see when we install any new software.).How can i do this?