参考：
1.http://extjs.com/learn/Tutorial:Writing_a_Big_Application_in_Ext
2.http://blog.extjs.eu/category/patterns/file-patters/
3.http://www.extjs.com/forum/showthread.php?t=47413
4.http://extjs.com/learn/Tutorial:Extending_Ext_for_Newbies_(Chinese)
