Property value inheritance is a feature of the WPF property system at the WPF framework level, whereby certain dependency properties can be locally set on an element at or near the root of a XAML element tree and then have their value inherited by all elements within the logical tree of child elements that also possess that property. Property value inheritance is not enabled by default, and enabling it does have some performance implications. For details, see Property Value Inheritance.
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Although property value inheritance might appear to work for nonattached dependency properties, the inheritance behavior for a nonattached property through certain object-object divisions in the runtime tree is undefined. Always use
RegisterAttached to register properties where you specify Inherits in the metadata.
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Properties on derived classes of PropertyMetadata are typically defined in the object model as read-write. This is so they can be adjusted after initialization of the instance. However, after the metadata is consumed as part of a call to Register, AddOwner, or OverrideMetadata, the property system will seal that metadata instance and properties that convey the specifics of the metadata are now considered immutable. Attempting to set this property after IsSealed is true on this metadata instance will raise an exception.