I want to load all sub pages of a parent page in to a dropdown list  control (not to a normal drop down vertical menu as we normally see)  and it need to redirect to the correct page once user select the page name from the list.

 I need to add the sub pages automatically in to the dropdown list when we are creating sub pages for that parent page.

Please can you advise if there is a free module? or something cheaper solution/module?  Please help.