Button image not loading on Custom Ribbon

J

Joshua

I've been following Ron de Bruin's examples on creating custom ribbon tabs
but I've ran into a problem. I'm trying to use my own images for the the
buttons but when I replace his image with mine, no image shows in excel

<button id="customButton1" label="Label 1" size="large" onAction="Macro1"
image="largered1" />

I've loaded a bmp image and changed its ID to largered1. I tried the same
thing with a png image, but no success.

What am I missing?
 
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