Can"t get ScriptManager.RegisterStartupScript in WebControl nested in UpdatePanel to work

I am having what I believe should be a fairly simple problem, but for the life of me I cannot see my problem. The problem is related to ScriptManager.RegisterStartupScript, something I have used many times before.

JavaScript method not working in ASP.NET User Control

I asked a question before about a JavaScript code you can see it here : How can I scroll down to a multiline TextBox's bottom line, Javascript's scrollIntoView is not working for this . Well, it was solved and the accepted answer was working.