Thanks for writing.
I think the best way to make your case work is to have a view model with a property named Image or Bitmap for example. It should be null by default. Then, you bind RadImageEditor's Source property to your Bitmap/Image property. When you navigate to your editor page, if your view model property is null and the image editor will display nothing. Finally when the web client finishes downloading the bitmap, you update your view model and the image editor should refresh itself.
Since it is possible that the image is not yet downloaded when you navigate to the editor page you can display a busy indicator until the download finishes.
Please write again if you need further assistance.
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