/**
* @cfg {String} tooltip (Optional)
*/
+ /**
+ * @cfg {Number} xs (Optional)
+ */
+ /**
+ * @cfg {Number} sm (Optional)
+ */
+ /**
+ * @cfg {Number} md (Optional)
+ */
+ /**
+ * @cfg {Number} lg (Optional)
+ */
/**
* Returns the id of the column at the specified index.
* @param {Number} index The column index