code: protected void setInternalValue(String newValue, boolean repaintIsNotNeeded) {
          super.setInternalValue(newValue);
          extension.setSignature(newValue, changingVariables || repaintIsNotNeeded);
      }
docs: Sets the internal field value. May sends the value to the client-side.
  
  @param newValue
  the new value to be set.
  @param repaintIsNotNeeded
  the new value should not be send to the client-side