how can I know when the node is fully expanded?

[saifeddineObey]

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when i call expandnode method i alwayse receive this error when i try to filter trought the data after the call.
*Here is the code:
expandNode(treeNode: TreeNode, all: boolean = false) { const node = this.tree.treeModel.getNodeById(treeNode.id); if (node != null) { if (all) { this.expandAllNodeLazy(node); } else { node.expand(); } } }
` this.devicetreeService.findNodePath(url).subscribe(
async node => {
this.searchNode = node;
//expand root
var root = this.tree.treeModel.getNodeBy((node) => node.data.entityId == '');
this.collapseNode(root);
this.expandNode(root, false);

    //expand computer
    var pc = root.data.children.filter(pc => pc.name == this.searchNode.computerName)[0];
   this.expandNode(pc, false);
    //expand communicationInterface
    var com = pc.children.filter(com => com.communicationInterfaceDataDTO.interfaceNo == this.searchNode.interfaceNumber)[0];
     this.expandNode(com, false);
    //is TCP/TP or HTTP, serial?
    if (this.searchNode.taId != 0) {
      var ta = com.children.filter(ta => ta.entityId == this.searchNode.taId)[0];
       this.expandNode(ta, false);
    } else {
      var ta = com;
    }
    var device = ta.children.filter(device => device.entityId == sysNr)[0];
    if (this.searchDeviceTyp == 'device') {
      //for auto scroll
      var node = device;
    } else {
      var node = await this.findNodeRecurse(device);
    }
    //select the node
    this.tree.treeModel.getNodeById(node.id).toggleActivated();
    //auto scroll to node
    var labels = document.getElementsByTagName("label");
    for (var i = 0; i < labels.length; i++) {
      if (labels[i].innerHTML == node.name) {
        labels[i].scrollIntoView();
        break;
      }
    }
  }
);`

alwayse after this.expandNode(root, false); I receive this error:
core.js:14597 ERROR Error: Uncaught (in promise): TypeError: Cannot read properties of undefined (reading 'length') TypeError: Cannot read properties of undefined (reading 'length')
and I tried this approach but i didn´t work because when the node take time to expand:
` if (root.data.children && root.data.children.length > 0) {
var pc = root.data.children.filter(pc => pc.name ==
this.searchNode.computerName)[0];

if (pc) {
this.expandNode(pc, false);

if (pc.children && pc.children.length > 0) {
var com = pc.children.filter(com => com.communicationInterfaceDataDTO.interfaceNo == this.searchNode.interfaceNumber)[0];

if (com) {
  this.expandNode(com, false);

.... }
}
}
}
}`