The AccessibleExtendedComponent interface should be supported by any object that is rendered on the screen.

  The AccessibleExtendedComponent interface should be supported by any object
that is rendered on the screen. This interface provides the standard
mechanism for an assistive technology to determine the extended
graphical representation of an object. Applications can determine
if an object supports the AccessibleExtendedComponent interface by first
obtaining its AccessibleContext
and then calling the
AccessibleContext.getAccessibleComponent() method.
If the return value is not null and the type of the return value is
AccessibleExtendedComponent, the object supports this interface.