@Override
  public Object stringToValue(final String s) {
    return s;
  }
Hex formatter that can be used to validate input for hexadecimal text fields. Taken from
http://forum.java.sun.com/thread.jspa?threadID=436233&messageID=3169976

<p>Slightly modified.
java/zylib/src/main/java/com/google/security/zynamics/zylib/gui/CHexFormatter.java