Combo box within Treeview Control

[mani]

Hi
        How can i connect the Treeview Control within Combobox. The treeview Hierarchy Level like this
Let u assume the Drop Down with in Treeviw like this
                                     Dropdown box within treeview

                                                     INDIA
                                                           Tamil Nadu
                                                            Delhi
                                                     USA 
                                                            Los Angles
                                                            California
 When i Select the node that time the node should be disply the dropdown selected item....

let me how can i connect the database structure and also how can i use the javascripts for selected node collections......
Regards
G. Manikandan