mxGraph.prototype.removeCellOverlay=function(a,b){if(null==b)this.removeCellOverlays(a);else{var c=mxUtils.indexOf(a.overlays,b);0<=c?(a.overlays.splice(c,1),0==a.overlays.length&&(a.overlays=null),c=this.view.getState(a),null!=c&&this.cellRenderer.redraw(c),this.fireEvent(new mxEventObject(mxEvent.REMOVE_OVERLAY,"cell",a,"overlay",b))):b=null}return b};