Enable Nape debugging with CitrusEngine.

After initializing the engine you need to enable a onEnterFrame listener to constantly refresh it all the debug images:

This is how I have done it:

           var params:Object = new Object();

           nape = new Nape("nape", params);
           nape.touchable = false;
           enableDebug();
           add(nape);
           

        private function enableDebug():void
        {
            debug = new ShapeDebug(GameVars.SCREEN_X,GameVars.SCREEN_Y);
            debug.drawBodies = true;
            debug.drawSensorArbiters = true;
            debug.drawConstraints = true;
            Starling.current.nativeOverlay.addChild(debug.display);
            stage.addEventListener(Event.ENTER_FRAME, loop );
        }

        public function loop( evt:Event ) : void {
            debug.clear();
            debug.draw(nape.space);
            debug.flush();
        }

It should be easy to adapt it to your needs. It's pretty straight forward!