Design pattern to enrich a class with new features

I have implemented a series of classes to manage search / detail page with JSF and PrimeFaces. More in detail, I've created an abstract class SearchDetailView<C extends BaseView, M> in order to centralize common functionality for Search/Detail page.

In short, I've a class MyView that extends the base SearchDetailView. Now I'd like to add another behavior to MyView, that is Confirm Dialog.

I'm wondering what design pattern I have to use? I was going to use the design pattern Decorator, but I don't need to add new behaviors at runtime, but I've already know what behaviors MyView needs.

I can't extends two classes (obviously), but I didn't like to have many combinations of "base" classes. I'd like to create a second abstract class like ConfirmDialogDecorator in order to add "dynamically" the extra functionality.

So, I ask you which design pattern add behavior to a class?

Actually my code is like the following:

public abstract class SearchDetailView<C extends BaseController, M> extends BaseView {
    [...]
}

public abstract class ConfirmDialogDecorator<C extends BaseController, M> extends SearchDetailView<C, M> { 

    public void showDialog(final String message) { [...] }

}

public class MyView extends ConfirmDialogDecorator<MyController, MyModel> { 
    [...]
}

But I'd like to separate ConfirmDialogDecorator from SearchDetailView. Any idea? Thanks.