With all the same option, only in a particolar sheet the cell doesn't
show the combo box with choice-setting in data validation.

The cell contains data validation (YES;NO) with the same options of the
cell in an other sheet. With a copy/paste the validation of cell is
correct but doesn't show the combo box!

I look for a particolar option in general setting of sheet, but ALL THE
OPTION are the same of the other sheet where the cell works correctly
(that is it shows the combo box)

Thanks in advance
M.