f99ab78 Disable enroll button if nothing selected.

Authored and Committed by edewata 12 years ago
    Disable enroll button if nothing selected.
    
    A new IPA.dialog_button class has been added to encapsulate the
    buttons in the dialog box so they can be managed more easily.
    
    The adder dialog has been modified to disable the enroll button if
    there is no entries selected.
    
    Ticket #1856
    
        
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