Wpf dependencyproperty binding not updating

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The line below works for the Text Box DP Text, where Cell No is a property of a class which derives from INotify Propertychanged.

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Basically I have an object in my view model that contains an Observable Collection of a custom object.My XAML's Data Context is set to my View Model, my View Model contains a 'Scratchdisk' object, and the Scratchdisk object contains an Observable Collection of Frame objects.Both the Scratchdisk and the Collection are set up as Dependency Properties.(something like "property x not found on object y").Now when debugging and checking the Set-Accessor of "bool Changes", I see that it never gets accessed when I set in the User Control Item Has Changes = true; Any idea what I'm doing wrong here?

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