hmmm, I am still a Java newbie but it looks like Eclipse is allowing
me to define the onValueChange() method as:

public void onValueChange(ValueChangeEvent<?> event) {
}

I think i have seen the "?" used in the docs somewhere.  Is it a
generic type placeholder?  Am I about to run into other trouble?

In the onValueChange() method it looks like I can then access the
value by casting it to what I expect; Date or String in my case.
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