how to fill the free space in my layout with substrate contacts.

 hi all,

  I want to fill the free space in my layout with substrate contacts. substrate tap consists of PWELL,PIMP,DIFF,METAL1,M1_DIFF contact. these layers are filled in layout  where there is no layers except prboundary.  I wrote following code for that which is not working properly.   iam new to skill .

.

 cv = geGetWindowCellView()
geSelectAllFig()
;for filling pwell where free space exist. but i did fill pwell where nwell doesnot exist.

leLayerAndNot( cv list("prBoundary" "drawing") list("NWELL" "drawing") list("PWELL" "drawing"))

;for pdiff in pwell

;to fill pimplant

leHiLayerGen()
leLayGenForm~>le0LayGenFormLayer1Field~>value= '(33556163 102 26 "PWELL  (drawing)")
leLayGenForm->layerGenOp->value="GROW BY"
leLayGenForm->layerSizeValue->value=-0.06

leLayGenForm->le0LayGenFormLayer3Field->value= '(33556165 102 26 "PIMP (drawing)")
hiFormDone(leLayGenForm)

;to fill diff
leHiLayerGen()
leLayGenForm~>le0LayGenFormLayer1Field~>value= '(33556163 102 26 " PWELL (drawing)")
leLayGenForm->layerGenOp->value="GROW BY"
leLayGenForm->layerSizeValue->value=-0.12
leLayGenForm->le0LayGenFormLayer3Field->value= '(33556165 102 26 "DIFF (drawing)")
hiFormDone(leLayGenForm)

;to  fill metal1

leHiLayerGen()
leLayGenForm~>le0LayGenFormLayer1Field~>value= '(33556163 102 26 "PWELL  (drawing)")
leLayGenForm->layerGenOp->value="GROW BY"
leLayGenForm->layerSizeValue->value=-0.12
leLayGenForm->le0LayGenFormLayer3Field->value= '(33556165 102 26 "METAL1 (drawing)")
hiFormDone(leLayGenForm)

but i dont know how to fill contacts automatically on it.  

Please help me to do this.

thanyou

venu