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Description
Because the Root element Did not have Treecontroller, It is not possible to select it by using "getControllerByNodeId()", and then It is not possible to use "addChild" for root node.
in debugger: (File: tree.service.js)
1. TreeService.prototype.getController = function (id) {
2. if (this.controllers.has(id)) {
3. return this.controllers.get(id);
4. }
5. return null;
6. };
dump of "this.controller" (Line2) indicate a list of all nodes in tree with a Treecontroller except the root node!!!