I've used Ron de Bruin's great custom ribbon tutorial, however whenever I try
to use custom images for button's they disappear. This is the code I'm using
for the paticular button

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

"largered1" is included in my xlsm file. It is a 48x48 bmp file, I've also
tried a png file, but no luck. What am I missing??