Need Help with "Channels" CS5

Question

I am learning about using channels as a mean of channel masking in CS5.  The instructor on a dvd starts with a general understanding of channels.  Within the first 2 minutes, I can't seem to replicate his instructions.
Here are steps I take to look at the individual channels Red, Green, Blue.
I invoke "Channels" in my layers palette. What appears is the RGB, Red, Green, Blue Channels (with the eyeball showing in each of the individual channels).
The instructor says to click on each of the channel and you will see the appropriate a tone map of each individual channels.
When I click onm lets say the red channel, nothing happens ... all of the layer eyeballs are still on and I get no individual tone map.  If I deselect all of the eyeballs, then I can get the individual channel tone maps.
I suppose that the instructor is using a short cut key to invoke each individual channel tone map, but he doesn't explain it.
Does anyone have an idea how to get an individual tone map directly after opening up the channels palette, without having to mannually remove each eyeball.

Answer 1

Click on the channel thumbnails themselves, not the eyes.
The keyboard shortcuts are shown to the right beside each channel in the channels panel.
(they are different shortcuts than below, which is cs3, but your channels panel should show the ones for cs5)
Do you have any adjustment layers or layer masks in your layers panel?