Hope things are going well in the UK! It sounds like you need to place code in the PostRequeryHook of the business object that loads the data for the combo box. For example:
This.Parent.Combobox.Requery()
If the data source for a combo box changes, VFP requires that you Requery the combo box.
Regards,
Kevin McNeish Eight-Time .NET MVP VFP and iOS Author, Speaker & Trainer Oak Leaf Enterprises, Inc. Chief Architect, MM Framework http://www.oakleafsd.com
