>>>I have no more ideas :o((( What happens if You recompile the Form? Or remove FoxUser.*?
>>
>>Compile didn't help. I guess, I just have to take this out of my mind. But I'm afraid, I would not be able to.
>
>This is clearly something going on with the form, not with the grid. Is the form's KeyPreview set to .T.? Try setting it to .F. Also, check the form's DblClick method.

Hi Barbara,

Thanks for helping. KeyPreview was set to .f., I changed it to .t., then back to .f., the behavior didn't change. Form's DblClick event is default. I'm going to proceed with re-creating this form method by method property by property to find the offender...