Manipulating ChatFrame2

[7strm]

I'm changing a few things on ChatFrame1, like simply repositioning the background for example. However, when I'm trying to do the same for ChatFrame2, nothing gets applied.

 
  ChatFrame1Background:ClearAllPoints()
  ChatFrame1Background:SetPoint("TOPLEFT", ChatFrame1, "TOPLEFT", -3, 3)
  ChatFrame1Background:SetPoint("BOTTOMRIGHT", ChatFrame1, "BOTTOMRIGHT", 3, -20)

  ChatFrame2Background:ClearAllPoints()
  ChatFrame2Background:SetPoint("TOPLEFT", ChatFrame2, "TOPLEFT", -3, 3)
  ChatFrame2Background:SetPoint("BOTTOMRIGHT", ChatFrame2, "BOTTOMRIGHT", 3, -20)

Do I need to call it at some specific later points for ChatFrame2?