I do like this. For BOLD and backcolors / forecolors
This code can go in the page activate or grid Afterrowcol event

for i = 1 to thisform.pageframe1.page1.Grid1.ColumnCount
xcol = "column"+allt(str(i))+'.'
thisform.pageframe1.page1.grid1.&xcol.DynamicFontBold = ;
'IIF(mark="Y", .t., .f.)'
endfor

thisform.pageframe1.Page1.Grid1.column1.dynamicbackcolor = 'iif(mark="Y",rgb(0,255,255),rgb(255,255,255))'
Hope this helps. Not positive I understand all your needs.