You should always use a Binding Source because it provides the plumbing you need to really make data binding work.I had used the Visual Studio designer to hook the controls to the Binding Source.
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On Validation didn’t fire because the control never had focus, so the change I made never go into my business object.
What I needed was an update mode of On Property Changed.
This means that the entities generated from these templates have simple ICollection properties.
However, when doing data binding it is desirable to have collection properties that implement IList Source.
EF generates code from your model using T4 templates.