Sheet can only sort UIOutput - Nothing happend with UILinkCommand and 
UIButtonCommand
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                 Key: TOBAGO-986
                 URL: https://issues.apache.org/jira/browse/TOBAGO-986
             Project: MyFaces Tobago
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.35
            Reporter: Sven Bunge
            Priority: Minor


If a column in a sheet is filled with a tc:link (UILinkCommand) or tc:button 
(UIButtonCommand) the Sorter-class is unable to sort the sheet.

There are several problems with the method Sorter#getFirstSortableChild(..):
* The children of a UICommand are recursive searched for a tc:out -> the 
algorithm look into the tc:link and tc:button.
* Only tc:out's are returned from the method
* .. the caller method invoke(..) get only the value-binding named "value" - 
The UILinkCommand and UIButtonCommand have no value-field. 

I optimized the getFirstSortableChild(..)-Method and introduced a new method 
how returns the ValueBinding.



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