docs: function (layer) {
  		var id = this.getLayerId(layer);
  
  		this._layers[id] = layer;
  
  		if (this._map) {
  			this._proxyMcgLayerSupportGroup.addLayer(layer);
  		} else {
  			this._proxyMcgLayerSupportGroup.checkIn(layer);
  		}
  
  		return this;
  	}