ASP.NET Ajax Framework on which all Telerik's Prometheus controls are based needs some additional settings in the Web.config file more detailed information about which you can find here
. For your convenience I have attached a Web.config file and a sample page which demonstrates how to use RadUpload in MultiView. In the example the skin which is set to RadUpload is the one you use - Office2007.
As far as it is concerned to changing the border color you can use the .ruInputs
css class and set the desired border and background color. In the attached sample they are set to white.
In case the above suggestions cannot help you solve he problem, please, send us your application so that we can test it locally, research the problem and do our best to help you.
All the best,
the Telerik team