Add Scroll Handler to DataGrid (GWT 2.4)

I need to add a ScrollHandler to the body of a DataGrid. I've tried
the following:

dataGrid.addHandler(new ScrollHandler() {

@Override
public void onScroll(ScrollEvent event) {
Window.alert("yes!!");

}
}, ScrollEvent.getType());

but it's not working.
Any ideas?
Thanks!

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.