We had not encountered your scenario till now. Unfortunately, you cannot use RadDragAndDropManager to drop items from the RadRichTextBox to other controls although the reverse scenario works fine. The reason for this is that mouse events are handled by the RRTB and don't reach the manager. However, you can try to implement your own logic for drag and drop. First of all you need to cancel the MoveSelectionCommand so that the selection would not be moved (as in cut), but copied.
sender, Telerik.Windows.Documents.RichTextBoxCommands.CommandExecutingEventArgs e)
Then you can attach to a mouse event of the desired control and having successfully found the proper place to insert text, get the selected text or DocumentFragment (basically a list of all selected document elements, paragraphs, images, etc.) obtained by one of the following two public methods:
The first one will get you text, images, etc. while the second will contain only text. If you want to insert images and other rich text, you should use the CopySelectedDocumentElements method and traverse through the document fragment, filtering the custom information you need to insert into the other control. If you encounter difficulties, contact us back.
All the best,
the Telerik team
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