Mat,

>The form that is working correctly has the following class definition:
>
>public class AssetForm : dstBusinessForm
>
>The form that is not working correcty looks like this:
>
>public class FilterForm : dstBusinessForm, IdstFilterObjectHost
>
>Could this definition cause a problem with the GetActiveForm method?

It shouldn't....why don't you get in touch with me via private e-mail and I'll get on your machine to take a look.

Best Regards,