function updateZ(model, view) {
	        var z = model.get('z');
	        var zlevel = model.get('zlevel');
	        // Set z and zlevel
	        view.group.traverse(function (el) {
	            if (el.type !== 'group') {
	                z != null && (el.z = z);
	                zlevel != null && (el.zlevel = zlevel);
	            }
	        });
	    }
@param {module:echarts/model/Series|module:echarts/model/Component} model
@param {module:echarts/view/Component|module:echarts/view/Chart} view