None of the SummerNote events is triggered at all

[Thai Van]

Does any body know why gwtBootstrap3 Summernote is not triggering any event at all?

here is my code

<b:InputGroup ui:field="message" addStyleNames="{style.message}">
    <summer:Summernote ui:field="body" debugId="createMessageViewBody" placeholder="{cons.newMessage}" />
</b:InputGroup>

body.addEnterHandler(new SummernoteOnEnterHandler()
{
    @Override
    public void onEnter(SummernoteOnEnterEvent summernoteOnEnterEvent)
    {
        Window.alert("SummernoteOnEnterEvent is triggered");
    }
});

//This line Window.alert("SummernoteOnEnterEvent is triggered"); is not executed at all.


Thanks
Thai