How do you make a ImageList in FMX do anything other than display 16x16 bitmaps?

How do you make a ImageList in FMX do anything other than display 16x16 bitmaps?

I naively tried to answer this question: http://stackoverflow.com/questions/37658692/image-in-tspeedbutton-with-timagelist 

But no matter what I do I cannot get the actionlist to do anything but display 16x16 glyphs on the buttons/menu's etc.

I've added an MVCE to the question. 
http://stackoverflow.com/questions/37658692/image-in-tspeedbutton-with-timagelist

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