Disappearing Ribbon Tab - Office Ribbons Pitfall One

So I was hand coding an xml file for a Microsoft Office Ribbon I was working on and had some trouble figuring out why it wasn't appearing in Word. Especially since it had been working flawlessly moments earlier.

<button id="btnAAP"
    label="Some Label"
    getScreentip="Some screen tip."
    supertip="Some super tip."
    onAction="OnAction" />

After building and installing my tab was nowhere to be found. Apparently specifying size and getSize in the same element is a big no-no. Understandably it has no idea which attribute to ignore but I figured it would pick a default. I would expect this behavior extends to all elements and any XXX/setXXX attribute pairs.

Hope this saves someone some headaches.