title: Python GTK3 button with image and label
body: <p>I'm trying to get buttons with image and label and didn't succed. I can have button with label OR image but not both.
  This is my part of code:</p>
  <h1></h1>
  <pre><code>try:
      pb = Pixbuf.new_from_file_at_size('myimg.jpg', 100, 100)
  except:
      pb = None
  img = Gtk.Image()
  img.set_from_pixbuf(pb)
  button1 = Gtk.Button(xalign=0.5, yalign=1)
  #button1.set_label(lbl)
  button1.set_image(img)
  button1.set_image_position(Gtk.PositionType.TOP)
  button1.get_style_context().add_class(&quot;btn_article&quot;)
  </code></pre>
  <p>any idea ?
  Thanks</p>