title: wxPython: Good way to overlay a wx.Panel on an existing wx.Panel
body: <p>I have a wx.Frame, in which there is a main wx.Panel with several widgets inside of it. I want one button in there to cause a "help panel" to come up. This help panel would probably be a wx.Panel, and I want it to overlay the entire main wx.Panel (not including the menu bar of the wx.Frame). There should be some sort of close button on the help button that will make it disappear again.</p>
  
  <p>What is a good way to achieve this? I've looked into wx.Notebook but haven't found a way to make it not show the tabs.</p>
  
  <p>Note that I don't want to destroy and recreate the help panel every time the user closes and opens it: I just want it to be hidden.</p>