We tried to recreate the explained scenario, but we were not able to reproduce the floating window behavior as described. However I have recorded and attached here video which demonstrates saving/loading a layout with/without floating windows. The video uses an example from our online XAML SDK repository which can be found on the following link:
Could you please provide us with more detailed information about the DependencyProperty and the exact setup in a support ticket. Also if you can send us a sample project it will be really helpful.
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