InlineUIContainers are not copyable document elements. This is so because the content of the UI Element may be set in many different ways (through data-binding, using an ItemsSource, etc.) and RadDocument cannot always clone the inner element.
One sample implementation of copyable IninleUIContainers can be found in this forum thread. Note however that we are not attempting to clone the UIElement in CopyPropertiesFromOverride method - this means that this container will work in Cut-Paste scenario, but will fail with an exception that the element is already added to the visual tree in Copy-Paste scenario.
After consideration, we have decided to make the default implementation not-copyable. You can try to alter the custom implementation to make if fit your needs.
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