Actually, the "OnSelectionChanged" callback function is in the 'viewerFrame'
and not in the 'mapFrame'. 
So the code should be:
  origOnSelectionChanged = viewerFrame.OnSelectionChanged;////Here not
getting anything "Undefind" showing

  Ofcourse, the above assumption is your reference/path to "viewerFrame" is
right, as said in another reply!

-Praveen
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