The formula
SUM($A1:$F1) + SUM($G1:$M1)
in cell AA1 is not moved correctly to Cell AB1 by TAdvSpreadGrid.MoveFormula
MoveFormula gives
=SUM($A1:$F1) + SUM($G1:N$M1)
The correct supported syntax is: '=SUM(A1:F1)+SUM(G1:M1)'
and this will update correct with MoveFormula()