Programming Language Concepts
                          Jan-Apr 2009
                          Assignment 3

                  Due Monday, 16 March, 2009

Write a Java Swing program to display a panel with three buttons,
labelled "Create Child", "Create Sibling" and "Paint Descendants
Red".

1. Pressing "Create Child" creates one more panel with three
   buttons that behaves exactly like the first one.  The new
   panel is considered a child of the panel that created it.
     
2. Pressing "Create Sibling" creates one more panel with three
   buttons that behaves exactly like the first one.  The new
   panel is considered a sibling of the panel that created it --
   that is, the new panel has the same parent as the one that
   created it.
     
3. Pressing "Paint Descendants Red" makes all panels which are
   descendants of this panel paint their backgrounds red, where
   descendants means children, children's children, ...