Disable 2nd monitor when undocking?

I posted this before but nobody replied so maybe I need to simplify it.
When I hit the eject button on my ThinkPad dock it turns off everything on the dock (including USB) except for DVI, which then causes Windows 7 to set both monitors to Duplicate at 1024x768. I just want it to disable the DVI monitor and go back to laptop monitor instead.
Is there a way to do this? I don't know why it keeps the DVI monitor going when the dock is ejected. Thanks.

Can somebody familiar with the dock please reply to this?
Hint: use Win+P to view monitor configurations.
When I press the undock button, it switches to Duplicate and both monitors (one DVI) show 1024x768 (even though all USB connections disconnect).

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#3 0x00007fe971aae8dd in ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
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#5 0x00000000004aa10a in xf86SaveScreen ()
#6 0x000000000046568d in dixSaveScreens ()
#7 0x0000000000561ee6 in mieqProcessInputEvents ()
#8 0x0000000000474119 in ProcessInputEvents ()
#9 0x00000000004371b2 in ?? ()
#10 0x00000000004269ea in ?? ()
#11 0x00007fe972f2fbc5 in __libc_start_main () from /usr/lib/libc.so.6
#12 0x0000000000426d31 in _start ()
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Disable 2nd monitor when undocking?

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