The documentation says that the GridGroupingControl supports expression columns but you can also set a column CellType to FormulaCell. What is the difference between these two features and why would you use one over the others.
I need a grid that has the ability to sort and filter columns and have columns with formulas that can be persisted with the data but that are predetermined before the data is assigned to the grid. I also want to be able to write custom formulas as well.
The GridGroupControl can easily sort and filter columns with very little added code and if you set a column CellType to formulaCell you have support for Excel style formulas.