The difference between the dialogs of RadEditor and RadUpload when used separately is that in RadEditor we use RadFormDecorator to style the form controls in the dialogs. When used separately, RadUpload is skinned by its skins only, and this is the cause for the difference. If you need to style RadUpload on a separate page you have to add RadFormDecorator on that page. Also, if you want to style only RadUpload you can put it in a <div /> with a certain ID, and then use this ID in the DecorationZoneID property of the control. Thus only the controls in that <div /> will be styled by FormDecorator.
Have a great weekend,
the Telerik team