Gets the top-level buffer in a ProDataSet object
at the specified index position. 
      Note: A top-level
buffer is a ProDataSet object buffer that is not a child in any
active data relation. There may be one or more top-level buffers
in a ProDataSet object.
      
        Return type: HANDLE
      
        Applies
to:
        ProDataSet object handle
      
     
    Syntax
      
      
      
        
          - 
            index
          
 
          - An integer expression indicating the 1-based index of the top-level buffer.