Two things come to mind:

1. The Forms collection also holds toolbars
2. What happens if no forms are open?

>I'm using VFP 7.0
>
>This doesn't work
>

>myForm.method()
>  LOCAL lo, lc
>  lc = WPARENT( THIS.NAME )
>  FOR EACH lo IN _VFP.FORMS
>    IF lo.NAME == lc
>      EXIT                             && Locals window shows lo as object here
>    ENDIF
>  ENDFOR
>  IF TYPE( 'lo.NAME' ) = 'C' ;         && Locals window shows lo as .F. here
>      AND lo.WINDOWSTATE = 1
>    lo.WINDOWSTATE = 0
>  ENDIF
>

>but this does
>

>myForm.method()
>  LOCAL lo, lc, loParent
>  lc = WPARENT( THIS.NAME )
>  FOR EACH lo IN _VFP.FORMS
>    IF lo.NAME == lc
>      loParent = lo
>      EXIT                             && Locals window shows lo as object here
>    ENDIF
>  ENDFOR
>  IF TYPE( 'loParent.NAME' ) = 'C' ;   && Locals window shows lo as .F. here
>      AND loParent.WINDOWSTATE = 1
>    loParent.WINDOWSTATE = 0
>  ENDIF
>