fixed paths to relative paths, so it works in root and virtual folders

If you run in a virtual folder as an application then the Url tracker is there, but it doesn't work... the path to the main page is not relative, so it cannot be loaded, and then the usercontrols cannot be loaded because they are outside of the application scope... adding ~ fixes this...
The  path to the aspx is made relative so that it always works, no matter where the application is running...