title: GMOD Lua - Add ENT:Draw Hook to Existing Entity?
body: <p>In Gmod Lua, how could I add a ENT:Draw hook for a specific entity which already exists on the map? Such as a door?﻿</p>
  
  <p>I have tried the following code:</p>
  
  <pre><code>door.Draw = function()
      self:DrawModel()
      ChatPrint("Hi")
  end
  </code></pre>
  
  <p>Which doesn't work.</p>
  
  <p>Any ideas?</p>