Tooltip/Description on customcheckbox(addon) not working

Hi Guys

I have modified customcheckbox to behave little differently i.e. Default mode is indeterminate when user click first time state changed to selected when user click again state changed to deselected as soon as user will create third time state will be again indeterminate.

https://vaadin.com/directory#addon/customcheckbox:vaadin

But due to some reason description/tooptip is not working with this new version of CustomCheckbox with vaadin addon version of CustomCheckbox tooltip is working fine.

Any body have any idea where could be the problem

Thank you so much for your time