Using Expose on external monitor only?

Hello All,
I have 2011 mbp that i sometimes use with an external monitor, with the monitor being my only display (closed clam-shell mode). I encountered a problem where the hot corners do not work? for some reason only the upper left corner works on the external display. if i use hot corners on my laptop screen, all the corners work? (I am not sure if this is relevant to solving this issue, but I use a wireless mouse when i use my external display.)
How do i fix this so that all the corners work as hot corners in expose on my external monitor?
Thank-you,
krm1897

We went through a similar discussion with the placement of the Dock with multiple displays, and found by experiment that the dock is placed on the specified edge of the main display (bottom, left, right), unless that edge was extended by an adjacent display along that edge, in which case the Dock was placed on the edge of the Extended Desktop.
I think Capt Fred is saying something similar for this as well.

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