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How to register same event handler with two widgets?

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I am kind of new to GWT. As a part of learning, I tried to create a StateCityCombo widget that comprises of state and city list boxes. If I register ChangeEvent handler with each, the compiler gives an error.

Relevant code:

@UiHandler ("stateCB")
public void onChange (ChangeEvent event)

If I try to register ChangeEvent handler with the city list box as:

@UiHandler ("cityCB")
public void onChange (ChangeEvent event)

The compiler complains about duplicate declaration of onChange. How can I register same signature event handler with two different widgets?

Thanks in advance for your help.

- Roger
It is sorta covered in the JavaRanch Style Guide.
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