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Hi, I'm using sencha framework to build trees from json and i get result like in this sample: http://dev.sencha.com/deploy/dev/examples/tree/two-trees.html but in my application i want to allow user to do some manipulations with this trees with drag-n-drop and i want get a result from some tree in json (json structure of the tree) so i could save it in db any idea how i can do this?