title: How can I restrict input into a TextInputCell in GWT?
body: <p>I'm trying to restrict input into a GWT TextInputCell for things like monetary values, dates, SSNs, etc. I'd like to restrict the character that they can type in to the field using a regular expression (ideally). I'm guessing that the only way to do this is to override the onBrowserEvent method on the TextInputCell, but I haven't been able to get it to work. </p>
  
  <p>What is the best way to mask my input cells?</p>