Change notification is working correctly on the properties I've defined on my concrete business object class but the IsValid property is not exibiting property change notification behaviour.
This a legacy from Windows Forms databinding and continued support for Windows Forms in Csla4. WinForms databinding imposes a number of restrictions and should only get change notification on data properties.
Csla.Xaml.ViewModel<T> will give you properties like CanSave (ie: IsDirty and IsValid) that uses change notification and is recommended for use with WFP and Silverlight.
Excellent! Thanks for the info.
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