Implement the HasXYZHandlers interfaces you need in your 
IndicatorTextField, e.g.:

public class IndicatorTextField extends Composite implements HasText, 
HasKeyUpHandlers, ...other handlers you need... {

  ....

  public HandlerRegistration addKeyUpHandler(KeyUpHandler handler) {
    return addDomHandler(handler, KeyUpEvent.getType());
  }

}


Now you can use:

@UiHandler("yourIndicatorTextField")
void onKeyUp(KeyUpEvent event) {
  //your event code
}


-- J.

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