title: Kivy: why is pop-up window semi-transparent?
body: <p>To whom it may concern,</p>
  
  <p>I am adding pop-up windows in my Kivy/Python application.  At first I was using the example provided in kivy.org pages: <a href="http://kivy.org/docs/api-kivy.uix.popup.html#module-kivy.uix.popup" rel="nofollow">http://kivy.org/docs/api-kivy.uix.popup.html#module-kivy.uix.popup</a> which was OK, but I wanted a more elegant solution, with kivy files.</p>
  
  <p>So I found one example in: examples\widgets\popup_with_kv.py, which is fine, but when I use it, as it is, it creates semi-transparent pop-up windows.</p>
  
  <p>Does anyone know why?</p>
  
  <p>Maybe someone has encountered the same issue before.</p>