For more extensive information on the packer and the options that it
can take, see the man pages and page 183 of John Ousterhout's book.
- anchor 
 
- Anchor type.  Denotes where the packer is to place each slave in its
parcel.
 
- expand
 
- Boolean, 
0 or 1.
 
- fill
 
- Legal values: 
'x', 'y', 'both', 'none'.
 
- ipadx and ipady
 
- A distance - designating internal padding on each side of the slave
widget.
 
- padx and pady
 
- A distance - designating external padding on each side of the slave
widget.
 
- side
 
- Legal values are: 
'left', 'right', 'top',
'bottom'.
 
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