Have you tried ThisForm.Grid1.RemoveObject('ColumnX')

>I have a command F3 "change grid form" in my form.
>This command destroys all grid columns and then adds new columns to grid.
>
>To destroy columns I use
>
>

>  this.gridbase1.columncount = 0  && C5 error occurs in this line
>

>
>I tried also
>
>

>  DO WHILE this.gridbase1.columncount>0
>    this.gridbase1.DeleteColumn   &&& C5 error occurs in this line
>    ENDDO
>

>
>Using those commands in VFP 7 will cause C5 error sometimes. This works in VFP 5.
>
>Is there a way to re-create grid columns to avoid C5 error ?