Dynamic Binding in TreeView with XML file

Question

Hi,
        I am new to wpf and mvvm. Actually i am working on a project in which i need to bind the xml file to treeview control in a dynamic way i have found in static way but i need to do it in dynamic way so please help me out .

Requirements: If i add the elements at runtime to xml file treeview should automatically gets updated .

Thanks
Karthi