Any Introductory Stuff on Extension?

[paladinjack]

I am thinking of writing a UI extension.
any introductory materials available here?

Thankx!

[benny_boi]

There's a really good 2.0 tutorial on extending classes in the Tutorials section of the website (http://extjs.com/learn/Tutorials)

Direct link: http://extjs.com/learn/Tutorial:Extending_Ext_Class

Enjoy!