Events are not serialized to XAML by design. You can customize the process additionally using the XamlFormatProvider.ImportSettings.InlineUIContainerImported and XamlFormatProvider.ExportSettings.InlineUIContainerExporting events. Convenient way to mark document elements is using the Tag property (this way you can distinguish the separate instances on import).
There is currently no built-in way to preserve/restore the document position, as it's bound to specific document instance.
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