> what I really want to do is have an image be a button,

Could you use a LinkButton with an image as its button data? Link buttons don't 
draw any additional decoration.

> ((ButtonDataRenderer)button.getDataRenderer()).setFillIcon(true);

FYI - by default, all buttons share a common renderer instance. Unless you have 
previously called setDataRenderer() on this button with a new instance, you 
will actually be modifying the default renderer (probably not what you want).

G

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