private void OnVmExpanded(object sender, EventArgs e)
{
ITreeItem parent = (ITreeItem)sender;
Console.WriteLine($"OnVmExpanded: {parent.Path} expanded");
List <ITreeItem> children = GetDescendants(parent);
if (children.Count > 0)
{
RemoveNodes(children);
parent.RemoveAllChildren();
}
CreateSubFolders(parent);
//Create children for parent's children
foreach (ITreeItem item in parent.Children)
{
CreateSubFolders(item);
}
}