Data Tree

Thanks for all the great documentaton, but I do have one question.

Is it possible to have the tree group json data on multiple fields?

Something like this:

tree = webix.ui({
view: “tree”,
container: “myContainer”,
activeTitle: true,
scheme: {
$group: “field1”, “field2”, “field3”,
},
data: [
{ id: 1, “field1”: “val1”, “field2” : “val”, “field3” : “another value”},
{ id: 2, “field1”: “val1”, “field2” : “val”, “field3” : “another value”},
{ id: 3, “field1”: “val1”, “field2” : “val”, “field3” : “another value”},
{ id: 4, “field1”: “val1”, “field2” : “val”, “field3” : “another value”},

(Deliberately left open parenthesis so that no one thinks this is working code.)

Thanks