Newbie: Frame woun't show

[tatsudoshi]

I am trying to learn scripting addons and taking things one at the time.
At this point I am doing frames and have this simple code:

<Frame name="GpsFrame" toplevel="true" enableMouse="true" movable="true" parent="UIParent">
	<Size>
		<AbsDimension x="110" y="25"/>
	</Size>
	<Anchors>
		<Anchor point="TOP"/>
	</Anchors>
</Frame>

The problem is that nothing shows up ingame, so what is missing or wrong?

EDIT:
I am following the beginners guide at mmhell.com and can't see the difference in the code.