Thank for the reply..
After read the post, i test my application, it's work ok (VS 2013 Framework 4.5 and ext.net Ver.5444)
Currently i have the problem only with the examples Ext.Net..
My application does not load script at the beginning..I'll try 'to insert a script .js in the header of pages to see if the problem appears in my application.
PS) Close the Thread