Is there a quick way to load the entire catalog tree of categories into a structured collection of some kind (ex: xml or parent/child class)? Something like:

Root Cat1
...Subcat 1
...Subcat 2
.....SubSubcat 1
.....SucSubcat 2
Root Cat2
...Subcat 1
.....SubSubcat 1
.....SucSubcat 2
.....SucSubcat 3
.....SucSubcat 4

I need a TreeList style control to render the entire catalog tree so the user can drill down into the catalog.