Rules for Applying Themes

Within ASP.NET, attributes and elements take precedence in the following order (first to last):

1.  Theme attributes in the @ Page directive

2.  <pages Theme=”themeName”> elements in the <system.web> section of a 

Web.config file

3.  Local control attributes

4.  StyleSheetTheme attributes in the @ Page directive

5.  <pages StyleSheetTheme=”themeName”> elements in a Web.config file