Load user control (which acts as menu) from different XML files

I need a way to find the xml file which is located in  the currect directory
(please see the screenshot)

now for folder NMI > zzObject.xml (contailns sitemap )
similarly and each folder has its own .xml file

now I have a user control which acts as a menu and that menu needs to be based on the xml file
So,
1. how does the user control know which page is using it
2. how does the user control acess the .xml file fom the directory where the page which has been loaded and then use it.
screenshot.jpg