Microsoft has just published a guide building a simple PRO-enabled management pack for Virtual Machine Manager 2008 R2. This document gives an overview of creating PRO-enabled management packs and walks you through the steps required to create a simple PRO-enabled management pack.
Download here.
Alexandre Verkinderen
Read the complete post at http://scug.be/blogs/scvmm/archive/2009/08/27/writing-pro-enabled-management-packs.aspx