GuiMessageVectorCtrl/MessageVector

I've been pluging away at this for a few hours now and I just can't seem to get it to work.

Could someone give me a short example of how to set up and use this?

I tried to follow the chathud that comes with the FPS demo, but it's rather confusing and I wasn't able to find any simple examples on how to use GuiMessageVectorCtrl and MessageVector.

thanks