how can add data source kendo-tree-view data, id in case projectattachmentfolderid , parent id - projectattachementfolderparentid var flatdata = [{ "projectattachmentfolderid": null, "projectattachementfolderparentid": -1, "projectattachmentfoldername": "root", "projectiattachmenthasuniquepermissions": 1, "projectiattachmentisfolder": 1, "cancreate": true, "candelete": true, "canread": true, "canupdate": true, "projectattachmentfolderid2": null, "projectiattachmentid": -1, "foldertype": null, "id": 0 }, { "projectattachmentfolderid": 5112, "projectattachementfolderparentid": null, "projectattachmentfoldername": "dokumenty klienta", "projectiattachmenthasuniquepermissions": 1, "projectiattachmentisfolder": 1, "cancreate": true, "candelete": true, ...