Not Listing Files

I'm working with the file vista control and i'm able to add folders and subfolders but not programmatically and either way I try to add folders I'm not getting the files within those folders to display.  Any suggestions?

Just to clarify I have a license and the folders are now appearing correctly and it displays that files are there within those folders it's just not showing those files.

Please make sure the files do not have "Hidden" attribute and that the executing user (ASPNET) has the permission to list files.