RadEditor does not offer such functionality out-of-the box and it is not part of the advertised features of the control.
Perhaps the best way is to implement your scenario as a separate solution using an editable DIV element
<div contenteditable="true" style="width:300px;height:300px;border: 1px solid red;">AAA BBB</div>
as the editor and a standard browser window.open dialog. If you are able to implement a fully functional solution using a standard editable DIV and a browser dialog, we will help you to replace the DIV with RadEditor.
All the best,
the Telerik team
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