I am not quite sure I understand your question.
The OpenDocumentCommand just opens an OpenFileDialog and loads the chosen file in the editor. You can invoke it like this:
You cannot have another dialog for choosing the file, due to Silverlight's security policies, but as long as you execute the OpenDocumentCommand on button-click, everything should work OK.
You can refer to our online help
for some examples on importing contents in the rich text box without using the OpenDocumentCommand.
Let us know if this does not answer your question.
All the best,
the Telerik team
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