Simple XML file to Display a button on screen

[winslowe]

Just started with Dev addons. I do best with examples.
I have tried a few things but they are not working.
Can someone give me a Simple XML file example of how to display a Click on button in the middle of the screen. From there I can learn how to move it where I want it.

I have this but it is not working.

<!-- MyButtonAddon.xml -->
<Controls>
<Button name="MyButton" inherits="ZO_DefaultButton" text="Click Me">
<Anchor point="CENTER" relativeTo="$(parent)" relativePoint="CENTER" offsetX="0" offsetY="0" />
</Button>
</Controls>