Connect two external monitors to mini DP(using a mini DP to VGA adapter) and the VGA out at once

I am trying to  connect two external monitors to mini DP(using a mini DP to VGA adapter) and the VGA out at once. Windows recognize both monitors as well. But it dowsn't let me use all three monitors at once(see the below image). In the dropdown, it lists all three monitors. Problem is there are two active displays I can select.

Mavec wrote:
I would like to add a third monitor.  
The GPU(s) in your T400 (and most other laptop brands) will support two different displays concurrently.  If you want to support more than two different displays concurrently, you will need another GPU external to the T400.
Generally, if you want to use two external displays on a T400 you will nee dto use a docking station.
I have read messages on various fora on this topic and know that there are a number of ways of doing this, but as I have never had a need to do this myself I can't tell you how to go about it.
Cheers,
Bill
I don't work for Lenovo

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