Setting Group owner in "Create SharePoint Group"

When creating new access groups, I would like to set Group owner to an existing SharePoint group.
This is no problem using the SharePoint GUI, but the “Create SharePoint Group” action returns errormessage:

Exception: Unable to cast object of type ‘Microsoft.SharePoint.SPGroup’ to type ‘Microsoft.SharePoint.SPUser’.

Is this a problem that can be “worked around” or fixed, or is this by design?

Thanks
Geir Mathisen

Thank you for bug report. Currently we have fixed it.
Please download the latest version of the product.

Tested and verified.
Thanks
Geir