JInternalFrame system menu working incorrectly in Motif Look And Feel
Steps to reproduce:
 - Run SwingSet2 demo.
 - Change Look and feel to Motif Look And Feel.
 - Select all Resizable, Closeable, Iconifiable, Maximizable checkboxes in InternalFrameGenerator(Default).
 - Now click on any of the buttons in Internal Frame Generator to generate/create a new internal frame.
 - Now see its window/system menu(By clicking left button on system menu area), You will find all its menu items are disabled. While we have created Internal frame with attributes closeable, maximizable, etc true. So those menu items should be enabled.
 - Now maximize internal frame by double clicking on title bar, now see its control menu again, Now menu items are enabled as expected.
 Instead of above step, Menu also works fine if you minimize the Internal frame and than restore it back.
 since: Tiger b09