For sample Save/Load Layout example you check this demo
from our XAML SDK repository as well as this example
from our online Silverlight demos. However I'm afraid the Name and Tag properties are not persisted and with the current implementation of the control is not possible to save additional properties. What I can suggest you would be to use the SerializationTag persist the needed Name and Tag properties and load them from there afterwards (you can do that in the ElementLoading event handler).
Hope this helps.
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