ChatFrame:SetInsertMode('TOP') ?? (prepend messages instead of append)

[ravagernl]

So I saw this UI which has the chatframe at the top of the screen rather then at the usual bottom.

I was wondering, since ChatFrame1 is a child of ScrollingMessageFrame... one should be able to call ChatFrame1:SetInsertMode('TOP') or ChatFrame1:SetInsertMode('BOTTOM'). Trying this ingame however does not seem to have any effect however, no errors in buggrabber or in FrameXML.log.

Now I'm curious how one would achieve this effect :P