I am trying to find a grid that supports artificial hiearchy. for instance, here is my simple table.

categorytype,category, part
hose, coolant hose, 1234
hose, coolant hose, 3433
hose, heater hose, 5555
hose, heater hose, 656
belt, timing belt, b1112
belt, timing belt, bb333
belt, serpentine, bs232

I want to tell the grid to make the first column unique with a + so it only shows:
hose
belt

and when expanded it expands the second hiarchial set "category" and then expands to part.

Is this doable?