/**
  * Asserts that this fixture's <code>{@link VFSJFileChooser}</code> is disabled.
  *
  * @return this fixture.
  * @throws AssertionError if this fixture's <code>VFSJFileChooser</code> is enabled.
  */
 public VFSJFileChooserFixture<FileObject> requireDisabled() {
   driver.requireDisabled(target);
   return this;
 }