Can calculated list grid field be grouped ?

[wwarriner]

SmartClient version v10.1p_2016-11-11/PowerEdition deployment ( built 2016-11-11)

I have a list grid field ( actually a icon representing a category ) that is calculated and displayed. ( To be clear the field is NOT in the datasource ).
Its implemented by declaring the list grid field and using a cellFormatter to generate its display value. Works well. Issue is I want to be able to group on the calculated field and grouping does not work. ( Single group value of none is displayed. )
Is it possible to group on calculated values and if so could you point me in the right direction.

Thanks

[Isomorphic]

See the Custom Grouping example - you have no actual record values, but the custom grouping APIs allow you to return whatever values you want to group on.

[wwarriner]

that did it ! Thanks