How do you adjust the brightness on a Thunderbolt Display

How do you adjust the brightness of a Thunderbolt Display attached to an iMac ?

I had this peculiar ‘issue’ hooking up to my MacBook Retina when my Thunderbolt Display was delivered but Applecare  - thanks Andrew - got me there. It seems daft!
The Thunderbolt Display Brightness slider IS there – you just have to know how to make it show up.
At initial set-up of the Thunderbolt Display [or if the Brightness slider is ever not visible in the System Preferences> Thunderbolt Display window], so long as the Thunderbolt [external] Display and the Macbook Display are ‘mirrored’ I can control the Thunderbolt [external] Display via my MacBook Retina Brightness keys [F1 & F2] – or by the Brightness slider that THEN appears in my System Preferences>Thunderbolt Display window. Once set up the Thunderbolt Display System Preferences Window continues to show the Brightness slider but I occasionally lose it if my MacBook has been disconnected from the Thunderbolt Display for some time – and I then have to start over.
So:-
Apple menu >
System Preferences>
Displays>
Click Arrangement [at the top]
Click Mirror Displays [at the lower left]
That then gives me-at-least a Brightness slider on the System Preferences> Thunderbolt Display window [as well as on the Built In Retina Display window] and I can then adjust them independently.
Oddly, having set this up just once the Brightness slider then remains on my Thurnderbolt Display and I can control it [and my MacBook Retina Display independently]. Occasionally I lose it again and have to start over.
Hope this works for others.

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