drag drop

Question

My requirements are
1. There is a treeview contains a parent nodes and more than one child nodes. While try to drag drop one child node to another a popup box appear.
2. In that popup box we can give the name of new node and after clicking the add button in popup box that new node must be seen in the treeview.
3. And the child nodes which we are trying to drag drop became the child of new node in the treeview.
How it is implemented in c# wpf. I am new in this field. I didn't get any proper solution. Please help me.