>>I cannot seem to get the ImageUrl property to see the GIF file in design mode, not even in the dialog box that looks for the file. It'll find any other graphics file, but not the GIF file. Is there some trick to this?
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>Don't know what other problem you may be having but, IIRC, the GIF file won't show up in the Properties Dialog box unless it has been added to the project.....

I think this is probably the issue. It's very common, especially with images.