ITunes Visualizer on External Display Blacks Out Main Display

Is it possible to have the iTunes Visualizer full screen on an external display while keeping the main display active?
In other words, I'd like to have my 2nd monitor display the iTunes Visualizer in full screen while I do work on my main screen. Every time I try this it forces the main screen to go black.
Does anyone have a solution, or is this just the limitations of iTunes and/or the Mac?
(By the way, the closest I've come is to put the iTunes window on the 2nd display, start the visualizer, and make its window as large as it will go. But, you still see the top of the iTunes chrome above and below the visualizer.)

I realise this is an old post, but have not yet seen an explanation of how I have solved this problem.
Its not a complete solution as it only works if you want to use iTunes, and does require an iPad or an iPhone.
First configure the Apple remote App on your iPhone, or iPad, or both   iPad is best, but iPhone works almost as well.
Check that you can control the music from your i'Device'
Drag the iTunes window onto the external screen/projector.   I am assuming external monitor with a different screen geometry to main screen, but if you can handle some gaps, you can mirror displays just as well.
Turn on the Visualiser - and put it into full screen.
If you can't see the external screen the following short cuts are useful. 
⌘T - turn on Visualizer
^⌘F - turn on Full Screen
Your main screen will blank out, but you will still have full control of your music from the Remote App.
Very cool if you are having a party, and want the visualiser on the large LCD TV, or on a projector. 
Steve

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