Returns TRUE if a specified row in the browse
viewport is currently selected.
      
        Return type: LOGICAL
      
        Applies
to:
        BROWSE widget
      
     
    Syntax
      
      
      
        
          - 
            n
          
 
          - An integer expression that specifies a selected row within the
browse viewport.
 
        
      
      The AVM maintains a numbered
list of selected rows, starting at 1.