[Bugs] #4082 sugar-artwork UNSP: Palettes not displaying the graphic of the slider

[Sugar Labs Bugs]

#4082: Palettes not displaying the graphic of the slider
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    Reporter:  manuq                      |          Owner:  manuq      
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  sugar-artwork              |        Version:  0.97.x     
    Severity:  Blocker                    |       Keywords:  13.1.0     
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 - TestCase: open palette of device icon Speak
  - TestCase 2: open Paint, go to palette to change color

 The slider is not visible only in this kind of palettes, which is
 _PaletteWindowWidget in palettewindow.py, inherits Gtk.Window .  The rest
 of the styling is set correctly, and other graphics are shown like the
 checkbox in Paint palette, or the button images in Speak palette.  The
 Control Panel window is another case that inherits Gtk.Window but unlike
 this palette, it is displaying the slider graphic, see Frame section which
 has two sliders.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4082>
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