title: PySimpleGUI output window
body: <p>I'm using PySimpleGUI to create GUIs in Python.
  I use the following parameters to create a window:</p>
  <pre><code>creditionals, no_titlebar=True, grab_anywhere=True, keep_on_top = True, alpha_channel=.9
  </code></pre>
  <p>and everything works normally, but when I use these options for output window opacity parameter gives me error:</p>
  <pre><code>sg.theme('DarkAmber')
  sg.Print('Starting Process...', do_not_reroute_stdout=False, no_titlebar=True, grab_anywhere=True, keep_on_top = True, alpha_channel=.9)
  </code></pre>
  <p>Without alpha_channel option output window generates normally, however with it error is occurring.
  If anyone has an idea about its solution, I would like to consider it.</p>