When using RadTab - RadMultiPage - RadPageView the content url for the page view loads twice on the initial load.
What am I doing wrong?
I am afraid I was not able to spot the problem by reviewing the provided code.
Could you please capture the current behavior with the Fiddler Jam tool and share the log so we can have a better understanding and assist you accurately. Check out how to Capture network logs & log issues with Fiddler Jam in ASP.NET Web Forms.