First steps in Extjs, who can help?

Question

ExtJS/Sencha

I sketched out the code from the examples, but does not want to start, who can help, what's the problem?
jsfiddle.net/f1ov8kxx
New to this Extjs, but need version 3

Answer 1

one.

// ...
 renderTo:Ext.getBody()
 // ...

2. Request from foreign origin blocked: Single origin policy prohibits reading the remote resource at dev.sencha.com/deploy/ext-3.4.0/examples/tree/chec... This can be fixed by moving the resource to the same domain, or enabling CORS.