title: draw a polygon over closed polylines
body: <p>i try to describe this problem well with my humble English skills :<br>
  i have closed blocks on my dwg file, these blocks are consist of many Polylines which are joined together but they are not uni-body (integrated), all i want is a lisp to draw a polygon over this block and create a uni-body block. is there any way around ? 
  thnx</p>