I looked into this a little bit more. I examined the html output of the page and I do see that the $find('<%= this.myTabStrip.ClientID%>') method is resolving to the ID of the div where my RadTabStrip is located but as I said, the check if(!tabStrip) still fails. This tells me that I am not grabbing the client side object for the tabstrip. What would cause this to happen? Do I need to make sure that the tabstrip is inside some other element in order for the client object to be accessible?