ChangeHandler for Element?

I'd like to add a ChangeHandler to a SelectElement, instead of turning
it into a ListBox. I've tried ListBox.wrap, but that gets an assertion
since it is not attached to the RootPanel. It seems you could do a
JSNI call to but I've not figured this out yet.

Here is a small sample to under stand.

Sample.ui.xml

<HTMLPanel>
<table>
<tr><td>Needs OnChange:<g:SelectElement ui:field=needsOnChange
name=a></td></tr>
<tr><td>Without OnChange:<g:SelectElement ui:field=noOnChange name=a></
td></tr>
</table>
</HTMLPanel>

Sample.java
class Sample {

@UiField SelectElement needsOnChange;
@UiFiled SelectElement noOnChange;

:
:
}

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