When the RadCoverFlow control resizes, its items should resize, too. This will keep the propotions of the RadCoverFlow control according its items.

For example:

<telerikNavigation:RadCoverFlow x:Name="CoverFlow" CameraViewpoint="Top" ShowScrollbar="true/False" ScrollbarPosition="bottom/Top">    

                <Image Source="images/Email.png" Style="{StaticResource ImageStyle}" />   

It would be very helpful to have an event on RadCoverFlow that indicated that a particular CoverFlowItem was double clicked (and indicate the logical item in a parameter).