code: function addSelect(vProperty) {
  				var sPropertyName;
  				if (!vProperty) {
  					return;
  				}
  				sPropertyName = typeof vProperty === "string" ? vProperty : vProperty.name;
  				if (!that._oSelectedPropertyNames[sPropertyName]) {
  					sSelectOption += (sSelectOption == "" ? "" : ",") + sPropertyName;
  					that._oSelectedPropertyNames[sPropertyName] = true;
  				}
  			}
docs: Adds given property (either the name of the property as string or an object with a property name) to sSelectOption and to this._oSelectedPropertyNames if not yet done