WPF: refreshing a control with a bound property using Model View View-Model?

If so, your problem is that your ViewModel doesn't implement INotifyPropertyChanged. WPF can't know that your "Editing" VM property has changed so it's not updating the button's binding.

When the code sets Editing to true, that doesn't appear to trigger the PropertyChanged event, so the Button has no idea that it should update the binding for IsEnabled. Try something like this.

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