Hi Trevor. Thanks for that whcih helped a lot.

Part of my problem was that when I was initially creating my BO subclasses, I coded it all from scratch. I have now gone back in and recreated them but used the SF template (I did not think it was necessary to use these if creating a Subclass). For this reason I thin, it was missing out bits , paertculalry in IitializeComponent.

Anyway, seem to have it workong now, so many thanks