Customizations to the Cash Receipts (RM_Cash_Receipts) window failing for GP 2010

This is a reposting of an article I originally wrote on my Developing for Dynamics GP blog.
I have had a number of support cases and newsgroup posts recently about Customization to the Cash Receipts (RM_Cash_Receipts) window failing to work for Microsoft Dynamics GP 2010 when they worked for previous versions.

