[Bugs] #2140 HIGH: Add ErrorAlert inherited from Alert to sugar-toolkit

[Sugar Labs Bugs]

#2140: Add ErrorAlert inherited from Alert to sugar-toolkit
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    Reporter:  m_anish        |          Owner:  erikos                     
        Type:  enhancement    |         Status:  new                        
    Priority:  High           |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit  |        Version:  Unspecified                
    Severity:  Unspecified    |       Keywords:  r?                         
Distribution:  Unspecified    |   Status_field:  Unconfirmed                
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 The resolution of #1842 uses a new ErrorAlert class. This is similar to
 ConfirmationAlert with exception that it has only one 'Ok' button.

 This alert class was coded after an elaborate design discussion on
 [http://lists.sugarlabs.org/archive/sugar-devel/2010-July/025194.html
 sugar-devel]

 The patch implementing this class is attached.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2140>
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