How to disable a custom widget and its click handlers

Hi. I'm making a custom button widget.

This button has a setEnabled method. When the button is disabled, clicking on the button must do nothing. How do I achieve this behavior? 

I've tried adding a Click Handler like so, to no avail:

@Override

public void onClick(ClickEvent event) {

if (!isEnabled()) {

event.stopPropagation();

event.preventDefault();

return;

}

}

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