>>>The recordsource is a readwrite cursor, indexed on each column into a temp cdx.
>>>
>>>What could cause such a situation? I've never encountered a grid which wouldn't pass a proper columnOrder (which is not zero for any column, checked that too) to ARCC.
>>
>>Do you have any code in other grid's methods? Or did you bound anything to grid's methods?
>
>The header1.rightclick was bound, but that wasn't it. I've found this line in the grid's init at the class level:
>
> THIS.ALLOWCELLSELECTION=.F.
>
>and that was the cause.

Almost every mystery has a simple explanation. Otherwise it is called a bug.