You can have the image aligned top and left by overriding the template of RadImageEditorUI and setting HorizontalAlignment="Left" and VerticalAlignment="Top" to the RadImageEditor control. The default value of both properties is "Stretch".
Please find attached a zip file of a XAML page, which contains RadImageEditorUI and its template has been modified in the way described above.
Greetings,
Iva Toteva
the Telerik team
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