How can I change the default value of an inherited dependency property?

by

The correct way to override a base class’s property is:

static TestControl() {

    FooProperty.OverrideMetadata(
        typeof(TestControl),
        new FrameworkPropertyMetadata(67)
    );
}

EDIT:

AddOwner is meant to share the same DependencyProperty across types that are not related (i.e. the TextProperty of TextBox and TextBlock).

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