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Lets say I’ve got a textbox and an attached property called Foo.Bar.
<Textbox local:Foo.Bar="5" />
Does the attached property hold a strong reference to the textbox?
No they should not, you can think of DependencyObejcts as dictionaries and of Dependency / Attached properties as keys in the dictionary.
The OnBarChanged can do whatever it wants with the TextBox though, it could potentially keep a strong reference to it somewhere.