core.lua

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