Pixel Map Shapshot

I am attempting to recall shapshots of different pixel map previews.  I have tried to record a shapshot with with pixel map 1 and then a snapshot of pixel map 2 in the pixel map preview tab.  When I recall the shapshots they do not change which pixel map is being displayed.  I was looking in macros and noticed that there is a soft key called "Pixel_Map_Snapshot"  I have not been able to find the documentation about this to see if this will accomplish what I am looking to do and playing with it I have not been able to achieve any productive results with using it in macros.    Does anyone know which document has information about this?  Or has anyone been able to find a way to recall different pixel maps in the pixel map preview?  I want to be able to find a way to use a macro or a shapshot that will always bring up the same pixel map and then a second macro or shapshot that will recall a different pixel map in the pixel map preview.

Thank you.  

I am running 2.3.3 software on an EOS TI.   

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