You cannot pass object properties as param by reference. The alternative solutions were already discussed in this thread.

Vlad

>How do I pass an array that is defined as a property on a form by reference? The following:
>
>Thisform.ChangeArray(@Thisform.aMyArray)
>
>Gives error:
>
>Alias 'Thisform' is not found.
>
>Am I sentenced to perform ACOPY before and after the call to Thisform.ChangeArray?
>
>--Paul