AngularJS tree example

I am implementing a tree with angular notation, but it doesnt seem to work. Can you provide an example of how the syntax would look like.

Thank you

Please check the next snippet
http://webix.com/snippet/f8431f53

The tree_data is a common json structure like next

[
    { id:"1", open:true, value:"The Shawshank Redemption", data:[
        { id:"1.1", value:"Part 1" },
        { id:"1.2", value:"Part 2" },
        { id:"1.3", value:"Part 3" }
    ]},
    { id:"2", value:"The Godfather", data:[
        { id:"2.1", value:"Part 1" },
        { id:"2.2", value:"Part 2" }
    ]}
]