Hi,
Instead of using DynamicForeColor use the DynamicBackColor of the Column in which you wish to change the color setting eg:
IIF(CurrFilters.MustEnter, RGB(128,255,128), RGB(255,255,128))

I have the above hardcoded into the grid. In this example for each cell of a column. The Other grid setting that effects the behaviour is having SPARSE = .T. in the column.