This code works for me to show the changes in the output window if I drop a GridControl on the form and add these handlers.
Private Sub Form1_Load(sender As Object, e As System.EventArgs)
Me.gridControl1.TableStyle.CellType = "FormulaCell"
Me.gridControl1(1, 1).Text = "4"
Me.gridControl1(1, 2).Text = "= A1 * 2"
AddHandler Me.gridControl1.SaveCellInfo, AddressOf grid_SaveCellInfo
End Sub ''Form1_Load
Private Sub grid_SaveCellInfo(sender As Object, e As GridSaveCellInfoEventArgs)
If Not (e.Style.FormulaTag Is Nothing) Then
Console.WriteLine("compute value at ({0},{1}) = {2}", e.RowIndex, e.ColIndex, e.Style.FormulaTag.Text)
End If
End Sub ''grid_SaveCellInfo