Thank you for your interest in RadRichTextBox.
Indeed, this is a limitation in the Silverlight platform. The only format supported by the Silverlight clipboard is plain text. Normally copy/pasting rich text (images, tables, formatted text) can only be done in one document or between two instances of RadRichTextBox in the same application.
In comparison with Silverlight, the WPF version of the control allows copy/paste of rich text from MS Word, OpenOffice, etc. and it works correctly, because of the framework.
If you have any further questions, do not hesitate to contact us.
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