Thunderbolt and MDP to VGA Adapter Compatibility Issue?

Hi Veterans,
I know this topic have been asked a lot of times by different people who faced the issue in different way. However, i am unable to find an absolute solution to the problem i am facing currently.
My question is, can a 3rd party made, Mini Display Port to VGA adapter works on MBP & iMac that have mini display port and not on those that have thunderbolt port??
I have a 3rd party made, Mini Display Port to VGA adapter that i have tried on 3 apple PC / laptop,
A MacBook (13-inch, Late 2009) which comes with Mini DispayPort, the adapter work with this laptop.
A iMac (21.5-inch, Late 2009) which comes with Mini Display Port, the adapter work with this PC too.
A MacBook Pro (13-inch, Late 2011) which comes with Thunderbolt port, the adapter does not work with this laptop. I have tried many solutions i can find on this forum and none helped.
The software is fully up-to-date as of 30 April 2013, running Mac OS X 10.7.5 (Lion).
Tried safe mode, does not helped.
Tried the boot up when monitor is already switched on procedure, does not helped.
In all cases, it was tested on the same external monitor. As my MBP was dual-booted using Bootcamp assistant 4.0, i also tried in windows-mode (windows 7) which didn't work too. In windows mode, the screen just keeps flickering while in mac-mode i get a light blue screen. In both cases, the external monitor shows nothing. The external monitor is a Compaq FP7317 monitor with native resolution 1280 x 1024 at 75.0 Hz.
All these trying have leave me very perplexed. From my research, the thunderbolt port is suppose to accept devices meant for mini display port. So how could an adapter that work on mini display ports, not work on a thunderbolt port? Can any expert enlighten me?

Problem solved. I picked up the MDP to VGA adapter and was able to use the monitors native res of 1920x1200 but the flicker and wavyness made it impossible to use. And yes the adapter had the current firmware. But what I discovered in the process was that in mirror mode I am unable to drive the monitor at optimum resolution. With that in mind I tried the MDP to HDMI adapter again, unchecking mirror mode, moving the Finder bar to the external display and SHAZAM. I have a rock solid display external display now running at 1920x1200 : )

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