Master track layouts

[Spacemen Tree]

Hey guys. Anyway to change the master track layout in mixer? Been trying this but no go. I can get the info ok in the first 3 lines of the script but then no result when I try to change the layout.

Any ideas?
Cheers

master = reaper.GetTrack(1,0)
retval, layout_str = reaper.GetSetMediaTrackInfo_String(master,"P_MCP_LAYOUT", "",0)
master_visible = reaper.GetMasterTrackVisibility() 

if master_visible == 0 then
  if layout_str == "Small" then
    reaper.GetSetMediaTrackInfo_String(master,"P_MCP_LAYOUT","",true) -- set default
  else
    reaper.GetSetMediaTrackInfo_String(master,"P_MCP_LAYOUT","Small",true) 
  end
end

[BluGenes]

not that this helps, but, I was trying to change it in the TCP today. I noticed it is grayed out if you right click on the master track and then open the layout menu, but, it is available for all other tracks.. so, apparently you can't.

[Spacemen Tree]

Yeah, I gave the API an in depth look but it seems it's not possible. Oh well...