null!=this.model&&null!=this.graphModelChangeListener&&(this.model.removeListener(this.graphModelChangeListener),this.graphModelChangeListener=null),this.container=null)};function mxCellOverlay(a,b,c,d,e,f){this.image=a;this.tooltip=b;this.align=null!=c?c:this.align;this.verticalAlign=null!=d?d:this.verticalAlign;this.offset=null!=e?e:new mxPoint;this.cursor=null!=f?f:"help"}mxCellOverlay.prototype=new mxEventSource;mxCellOverlay.prototype.constructor=mxCellOverlay;mxCellOverlay.prototype.image=null;