[Bugs] #3890 untriaged UNSP: Style subtoolbar background

[Sugar Labs Bugs]

#3890: Style subtoolbar background
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    Reporter:  manuq                      |          Owner:                             
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  untriaged                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by manuq):

 This happens only the first time the subtoolbar is expanded, via a click
 on the toolbutton.  The other times the modify_bg in _setup_page is
 applied well.  And doesn't happen if the subtoolbar is expanded via a
 hover in the toolbutton.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3890#comment:1>
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