[macvoiceover] ituns and radio stream

hi all
when i try to interact with the table that has the categories of radio stations 
how can i get in to the stations included under each category? i assume that 
there is a command that allows me to expand navigating through the table. i can 
not do that by pressing the right arrow. so can any one tell me this command 
please?
kind regards.
Ahmed.

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