@Nullable
  @Override
  public String validateInput() {
    if (myUseNumAfterFilter.isSelected()) {
      try {
        Long.parseLong(myNumAfter.getText());
      }
      catch(NumberFormatException ex) {
        return getChangeFromParseError();
      }
    }
    if (myUseNumBeforeFilter.isSelected()) {
      try {
        Long.parseLong(myNumBefore.getText());
      }
      catch(NumberFormatException ex) {
        return getChangeToParseError();
      }
    }
    return myDateFilterComponent.validateInput();
  }
@Nullable
  @Override
  public String validateInput()