Copyright (c) SEMM NL All rights reserved.
Author : Paul Hamaker. Part of JavaLessons.com
3 components will be disabled the first time .
Next click the components are made invisible, but they still exist .
Restored at the next click .
We request the contentpane's appearance to be updated, where needed.
setState and setVisible are inherited methods, inherited from java.awt.Component.
We need a JComponent reference to be able to call revalidate.