>This happens because the ASPX Page is based in the class declared in the aspx.cs and it does not have access to the private members.

Which is declared as:

public class Default : System.Web.UI.Page

so I'm still not clear why does the CodeBehind page which can see the page objects does not allow the page object to get to its own click method (which BTW was automatically defined as private by VS 2003).