filterFactory.id(FeatureUtils.stringToId(filterFactory, features[0].getID())));
EditBlackboard bb = handler.getEditBlackboard();
PrimitiveShape shell = bb.newGeom(null, null).getShell();
handler.setCurrentShape(shell);
bb.addPoint(25,0, shell);
bb.addPoint(35,0, shell);
bb.addPoint(35,65, shell);
bb.addPoint(25,65, shell);
DifferenceFeatureCommand command=new DifferenceFeatureCommand(handler, EditState.NONE);