It was due to the font size setting of the PC.
The one who gave me the problem was set to large font.
Read the Thread ID: 695339 Message ID: 695475
it gives the solution to control and manage the grid size
Alessio



>We encountered the same problem. We have an application that has run under VFP5 on WNT machines. We have never had a problem with grid displays.
>
>We are changing over to WINXP Professional. After moving the application we received the grid height evaluates to illegal value error.
>
>We changed display values on the desktop to no avail. We then changed the themes from Windows XP to Windows Classic and this solved the problem.
>
>>It looks like it was my lucky month !!!
>>To allow users to choose multiple filters on a table, i put a grid on a form.
>>clicking on a command button i minimize it to the headerheight value
>>
>>.mygrid.height = .mygrid.headerheight + 1
>>
>>clicking on its header i maximize it
>>
>>.height = heightval
>>
>>It works fine, or better it works perfectly on all PC but one.
>>On this bloody one it gives me the error that the object miagrid has evaluated an illegal value. This doesn't make sense to me.
>>
>>Alessio
>>
>>PS Thank you all once again