How can I extend back-office(dashboard and tree) in Umbraco 6.x?

Question

I would like to extend back-office(dashboard & tree) in Umbraco 6.x Please introduce some good references about it or explain it. I've watched a move about it but it wasn't good special in extending tree! For example I want a custom tree in back-office like this:

                 CustomeTreeNode
                 |
                 |---SubTreeNodeA
                 |---SubTreeNodeB

"SubTreeNodeA" & "SubTreeNodeB" can contains sub nodes.

Answer 1

Although the documentation is not there yet, there are several threads about this in the Umbraco forum, e.g.

http://our.umbraco.org/forum/developers/extending-umbraco/42240-Custom-Tree-in-Umbraco-6

And a reasonable article here:

http://www.theoutfield.net/blog/2012/07/creating-custom-applications-and-trees-in-umbraco-48plus