-------------------------------------------------------------------------

 STARTBOX and ENDBOX
 Specifies a inverted 3D box in the panel. Example:
 Startbox
   text "This text and the next button"
   button "will be within a box"
 endbox

 Note 1: You must have a GAP (se the gap command) of 2 or more for the
 box to be seen.

 Note 2: If you make use if the ROWS command, it is possible for a
 box to begin on one column and end on another. Then this will look
 like there is two boxes. But the line between them is so thin, that
 it looks like the items are grouped together anyway.

 Note 3: The boxes can not be nested.

 -------------------------------------------------------------------------