Build ExtJS tree on fly

I 开发者_如何转开发am beginner in ExtJS programming, and I looking for the best approach to implement the following:

I need to build ExtJs tree dynamically, on fly by dragging and dropping available nodes and leaves to the treepanel.

Please suggest anything, any help will be greatly appreciated.

Also, you may want to check out Saki's website below - it has some good code examples. Look at the "Drag and Drop" section where he has a tree and grid example.

http://examples.extjs.eu/