How to use EventBus for non-Presenter class in GWTP?

[Tom]

I am using GWTP platform & eClipse to build webapp. In Eclipse, when 
creating a Presenter, it will create 3 files (ex: SearchPresenter.java, 
SearchView.java, & SearchView.ui.xml):

public class SearchView extends ViewImpl implements SearchPresenter.MyView

public class SearchPresenter extends
    Presenter<SearchPresenter.MyView, SearchPresenter.MyProxy>{
    ....
    private EventBus eventBus;
    @Inject
    public SearchPresenter(final EventBus eventBus, final MyView view) {
         super(eventBus, view);
        this.eventBus=eventBus;
    }
}

To use eventBus, we just simply use eclipse to create EventBus file, ex 
MyEvent.java, then we call eventBus in SearchPresenter by using this code:

MyEvent mEvent=new MyEvent();
SearchPresenter.this.eventBus.fireEvent(mEvent);

now suppose I got a non-presenter class public class SearchDialogBox 
extends DialogBox, then my question is how can i use MyEvent in 
SearchDialogBox? How to getEventBus() in SearchDialogBox?

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