Get the page count of a reportTag(s): Datawindow

Put the datawindow into print preview mode 
dw_1.modify &
  ( 'datawindow.print.preview=yes' )
Get the result of the 'PageCount()' expression 
ll_PageCount = &
   long ( dw_1.describe &
     ("evaluate('pagecount()'," + string ( dw_1.rowcount() ) + ")"))

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