BlackUI

local GetChildrenTree

local f = CreateFrame("Frame")

f:SetScript("OnEvent",function()

  GetChildrenTree(UIParent)

  end)

f:RegisterEvent("PLAYER_ENTERING_WORLD")

function GetChildrenTree(Parent)

  if Parent:GetChildren() then

    for _, Child in pairs({Parent:GetChildren()}) do

      for _,r in pairs({Child:GetRegions()}) do

        if r:GetObjectType() == "Texture" then

          r:SetVertexColor(0.2,0.2,0.2) -- 1.0 = 100% light, 0.0 = 100% dark, 0.2 = 20% brightness

        end

      end

      GetChildrenTree(Child)

    end

  end

end