code: protected boolean isButtonEnabledForSelectedMessages(List<HttpMessage> httpMessages) {
          for (HttpMessage httpMessage : httpMessages) {
              if (httpMessage != null && !isButtonEnabledForSelectedHttpMessage(httpMessage)) {
                  return false;
              }
          }
          return true;
      }
docs: Tells whether or not the button should be enabled for the given selected messages.
  <p>
  By default, it returns {@code true} unless the method {@code isButtonEnabledForSelectedHttpMessage(HttpMessage)} returns
  false for one of the selected messages.
  </p>
  
  @param httpMessages the selected messages in the message container
  @return {@code true} if the button should be enabled for the given selected messages, {@code false} otherwise.
  @see #isButtonEnabledForSelectedHttpMessage(HttpMessage)