I have a rich:messages which contains all kind of msg in a form. Everytime I submit the form, the message box appears (showing the form is submitting), which will push the content of the pages down. After the page renders, the message box disappears, which push the content of the page up. The content is up and down very annoying. What is the best way to research some spaces for the rich:messages so that the content of the page does not jump up and down? Thank you!