An example is a data provider that is a List<People> and I want my grid to display my collection of People in a 4x4 grid. Is there a way to do that?
You could create 4 columns of type "Person" and invent a new class that represents your table rows, lets say "PersonGroup". Your table would then display PersonGroups and each PersonGroup contains 4 Persons that you can render in your columns. With 4 PersonGroups containing 4 Persons each you could mimic your 4x4 grid.
But CellTable/DataGrid is really meant for tabluar data and not for design/layout purposes.
-- J.