Destroy a widget

Hi:

I use GWT 2.3 and this question may sound a little bit weird 

I create a Widget component calling initWidget(uiBinder.createAndBindUi(this)) into  uibinder owner constructor method.

public HelloWorld()

 {

    initWidget(uiBinder.createAndBindUi(this));

 }

Therefore, uibinder owner implements onEvent() to receive events

When I invoke 'new HelloWorld()'  , a new Widget

I don't know how GWT implements if I call many times  'new HelloWorld()'  , but if a event is fired , is received by all of them.

I'd like that if I do 

HelloWorld h1 = new HelloWorld();

HelloWorld h2 = new HelloWorld();

I could "to destroy" h1 such as when I do h1 = null in Java language, so new fired events only be received by h2

is it possible ?

I don't want to remove from parent , I want to destroy that reference , but I don't know how GWT implements it 

Thanks & regards

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