def do_resize_children(self):
cell_rects = self._grid.make_cells(self.rect)<EOL>for ij in self._children:<EOL><INDENT>align_widget_in_box(<EOL>self._children[ij],<EOL>cell_rects[ij],<EOL>self.cell_alignment)<EOL><DEDENT>
Align each child widget within the box made for its cell.

Its possible (and not uncommon) for a widget to be the same size as its 
cell.  In this case, the widget will simply fill its cell.  Any widgets 
that are smaller than their cells will be positioned according to the 
`cell_alignment` attribute.  `do_claim()` guarantees that no widget can 
be bigger than its cell.