div containing disabled button not showing tooltip

[amoebauk]

new Tooltip('groupSpecialtySubmitButtonDisabled', {backgroundColor: '#333', borderColor: '#000', textColor: '#FFF', textShadowColor: '#000'});

        <div id="groupSpecialtySubmitButtonDisabled" title="Specialty cannot be submitted until all sections have been completed">
            <g:submitButton name="groupSpecialtySubmit" value="groupSpecialtySubmit" disabled="true"></g:submitButton>
        </div>

Does not work. If I remove the buttons disabled element it does. Is this a bug or just a limitation? Any workaround?