I try to use XamTree in my app. The data for the XamTree is bound to ItemSource. After that, I need following kind of code to expand the tree:

 foreach (var item in this.MyTreeview.XamTreeItems)
            {
                ((XamTreeItem)item).IsExpanded = true;
            }

With the codes, it needs to hookup async complete event. That is not what I want.

As the ItemSource could be dynamically and loaded by VM with async call with wcf-ria service. I want to everytime then Data for ItemSource loaded by VM, the the tree can be expanded automatically without code. Anyway to do it with some setting in Xaml?