Hello Borislav

I can't get your example running.

I tried hardcoded.
(disable row 1 to 4)

*allow method
lbAllowCellSelection = .t.
l_firstday = 5

if mycursor.day < l_firstday
lbAllowCellSelection = .f.
endif

thisform.pageframe1.page1.grid1.AllowCellSelection = m.lbAllowCellSelection
...

Seems that all rows are disabled now ??

Best regards
Albert