You have to program the download of the image yourself into the application because of the reason you describe. It is even a little more complicated than that right now since there is no export of the image content back into the WDA application. You have make another call to the IGS using the lower level API classes and re-render the same image in order to have the content to download. In 7.02 we will fix that problem by allowing a new UI element property with the image content in binary format. you can just data bind to that property and download the value in the bound context attribute.
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