Class AccessibleExtendedTable provides extended information about
a user-interface component that presents data in a two-dimensional
table format.
Applications can determine if an object supports the
AccessibleExtendedTable interface by first obtaining its
AccessibleContext and then calling the
AccessibleContext.getAccessibleTable()
method.
If the return value is not null and the type of the return value is
AccessibleExtendedTable, the object supports this interface.