How to expand all the child nodes of the selected TreeNodeAdv programatically in WinForms TreeViewAdv?

//The event is raised on TreeNodeAdv selection.
private void treeViewAdv1_AfterSelect(object sender, EventArgs e)
{
    string selectedNode = this.treeViewAdv1.SelectedNode.Text;
    if (this.treeViewAdv1.Nodes.Count > 0)
    {
        foreach (TreeNodeAdv treeNode in Collect(this.treeViewAdv1.Nodes))
        {
            if (selectedNode == treeNode.Text)
            {
                //Expands all the TreeNodeAdv.
                treeNode.ExpandAll();
                break;
            }
        }
    }
}

'The event is raised on TreeNodeAdv selection.
Private Sub treeViewAdv1_AfterSelect(ByVal sender As Object, ByVal e As EventArgs) Handles treeViewAdv1.AfterSelect
   Dim selectedNode As String = Me.treeViewAdv1.SelectedNode.Text
   If Me.treeViewAdv1.Nodes.Count > 0 Then
      For Each treeNode As TreeNodeAdv In Me.treeViewAdv1.Nodes
           If selectedNode = treeNode.Text Then
               'Expands all the TreeNodeAdv.
               treeNode.ExpandAll()
               Exit For
           End If
      Next treeNode
   End If
End Sub