-  Recursion is in use. Be carefull of problems with referencing the parent
    group from a child element.  Someone could add a max_level in there to be safe.

 -  If you overlap item co-ordinates, be carefull.  I dont have Z-order checking
    in here either yet and can makes tables get goofy.   Your table will look correct if
    all of your coords are correct. "Garbage in -> Garbage out"