def set_row_height(self, row, new_height):
self._grid.set_row_height(row, new_height)<EOL>self._repack()<EOL>
Set the height of the given row.  You can provide the height as an 
integer or the string 'expand'.

If you provide an integer, the row will be that many pixels tall, so 
long as all the cells in that row fit in that space.  If the cells 
don't fit, the row will be just tall enough to fit them.  It is common 
to specify a height of "0" to make the row as short as possible.

If you provide the string 'expand', the row will grow to take up any 
extra space allocated to the grid but not used by any of the other 
rows.  If multiple rows are set the expand, the extra space will 
be divided evenly between them.