collapsed items in radio stream

[larry]

Hello,
I listened to the excellent podcast on using itunes on blindcooltech.  The 
author of the podcast was examining radio streams and was looking at songs and 
expanding the collapsed listings.  I don't k know how to open the collapsed 
list to find the specific items in the streams ie 50's and 60's streams.  How 
do you open the tree?  Also what is the best method of examining the podcast 
directories with itunes?
Thanks much for your help.
larry