Group data in Cell Widgets

I'm using a CellList to display a list of projects. Now I need to
group the the list according to user selection. For instance, the user
can decide to group his projects by date:

Does anyone know how can I implement this functionallity? The list can
contain up to 1000 rows, so for performance reasons I would like to
keep using cell widgets.

I have thought of using a CellTree but I really do not need the
category to be selectable, nor to expand collapse its content.The
other alternative I have thought of is extending CellList.

Any help is appreciated. Thanks!

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