MacBook Pro's Color LCD "shifts" when connected to external display?

I have a 2010 MacBook Pro with the hi-res anti-glare screen. I just noticed that the internal color LCD "shifts" its colors when I connect it to an external display (a Dell 2408 WFP). If I disconnect the external display, the colors internal color LCD go back to "normal".
I have two images to show what I mean:
This is what it looks like with the external display disconnected i.e. the MacBook Pro on its own: <http://www.flickr.com/photos/vazexqi/4558641163/sizes/l/>
This is what it looks like with the external display connected: <http://www.flickr.com/photos/vazexqi/4559271260/sizes/l/>
The wallpaper is from pixelgirlpresents.com. I didn't notice this problem before with my older 2006 Core Duo MacBook Pro (OS X 10.5.7).
My guess is that with the external display connected, somehow the color LCD decides to use the external display's profile as well (instead of its own).
Any ideas on why this is happening? And, more importantly, any ideas on how to fix this?
Thanks.
Nick
Message was edited by: Nicholas Chen

@Stefan: Thanks for the tip. I tried it but unfortunately it didn't solve the issue. The color is still off.
Incidentally, just out of curiosity, I tried these two things:
1) I tried the "Mirror Displays" option in the Displays Preference Pane. With this option enabled, both displays actually displayed the right colors (right with respect to how each display is calibrated).
2) I opened the same desktop wallpaper in Preview. Whenever I drag the Preview window so that it spans/crosses both displays (external and Color LCD), there is a light flicker in the wallpaper in the Preview Window. For that brief moment, I can see that the color is right before it changes to the shifted color on the Color LCD.
I found a possibly related thread on a different forum <http://arstechnica.com/civis/viewtopic.php?f=19&t=37841>. That doesn't seem to help when both displays are connected.
Now, I am just wondering if this is considered normal - wonky color shifts between the desktop/different windows happen when you have two displays connected....
Nick
PS: Note that I am not a graphics designer so my definition of right/wrong is just based on my experience looking at the wallpaper and remembering what it should look like on each display by itself.

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