sizer_derivative.lua

  local sizer = CreateFrame('Frame',nil,WorldFrame,'SecureHandlerStateTemplate')
    sizer:SetAllPoints(true)
    sizer:Execute('children = newtable()')
    sizer:SetAttribute('_onstate-mousestate',[[
      wipe(children)
      self:GetParent():GetChildList(children)
      local f,c
      for i = 1,#children do
        f = children[i]
        if strmatch((f:GetName() or ''),'^NamePlate%d+$') then
          c = f:GetChildren()
          c:SetWidth(]]..psize[1]..[[)
          c:SetHeight(]]..psize[2]..[[)
        end
      end
    ]])
    RegisterStateDriver(sizer,'mousestate','[@mouseover,exists] on; off')