Thank you for the provided project.
To make it work we added a DataContext
to the Parent control (in our case the StackPanel). In that way the bindings get valid and the Label is able to "find" the metadata of the property to which it is bound.
Probably, the case is that the MS controls are optimized and there is no need to write special code to make the Target property work correctly.
Please find the attached project.
If you have any other questions please feel free to contact us again.
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