RichTextBox: XamlParseException is thrown when importing a XAML document that contains a Content control with PrefixMappings to its TextProperties` DataBinding
When importing a XAML document that contains a Content control with PrefixMappings to its TextProperties` DataBinding an exception is thrown: 'Telerik.Windows.Documents.Model.StructuredDocumentTags.DataBinding.PrefixMappings' threw an exception.'