Please an Example with Layout Border a Nav Panel and a Center that changes

[fdp]

Hi,

Please I would like to see a working example with a simlpe border layout:
west, center

A simple navigation panel on west with few buttons
Buttons on west would change the center panel

Actually i'm unable to do this simple task with extjs4, i receive things like:
uncaught exception: [Exception... "Component returned failure code: 0x80004003 (NS_ERROR_INVALID_POINTER) [nsIDOMHTMLDivElement.insertBefore]" nsresult: "0x80004003 (NS_ERROR_INVALID_POINTER)"

Thanks

[estesbubba]

This is some pretty trivial stuff, and if you're just learning Ext JS, I wouldn't start with a developer preview. I would suggest starting with the learning center and Ext JS 3.3. Look at the examples and their source and you'll learn a lot.