Based on the feedback from another post (http://forum.strataframe.net/FindPost13906.aspx) I was attempting to use OnValidate to update the data source. However, when I set this for a custom control I made, the set property never got fired (the data source was never updated). I implemented a property change event, but I'm thinking I must need a validate event also. What do I need to implement on this control to get OnValidate to work?

I'll look into this. This is a sub classes TextControl, by implementing IBusinessBindable. I'll have to see if it has/raises the Validating event. It should be fun if it doesn't