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.

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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/