+ /**
+ * @cfg {Boolean | Object} grid
+ * The grid configuration enables you to set a background grid for an axis.
+ * If set to *true* on a vertical axis, vertical lines will be drawn.
+ * If set to *true* on a horizontal axis, horizontal lines will be drawn.
+ * If both are set, a proper grid with horizontal and vertical lines will be drawn.
+ *
+ * You can set specific options for the grid configuration for odd and/or even lines/rows.
+ * Since the rows being drawn are rectangle sprites, you can set to an odd or even property
+ * all styles that apply to {@link Ext.draw.Sprite}. For more information on all the style
+ * properties you can set please take a look at {@link Ext.draw.Sprite}. Some useful style properties are `opacity`, `fill`, `stroke`, `stroke-width`, etc.
+ *
+ * The possible values for a grid option are then *true*, *false*, or an object with `{ odd, even }` properties
+ * where each property contains a sprite style descriptor object that is defined in {@link Ext.draw.Sprite}.
+ *
+ * For example:
+ *
+ * axes: [{
+ * type: 'Numeric',
+ * grid: true,
+ * position: 'left',
+ * fields: ['data1', 'data2', 'data3'],
+ * title: 'Number of Hits',
+ * grid: {
+ * odd: {
+ * opacity: 1,
+ * fill: '#ddd',
+ * stroke: '#bbb',
+ * 'stroke-width': 1
+ * }
+ * }
+ * }, {
+ * type: 'Category',
+ * position: 'bottom',
+ * fields: ['name'],
+ * title: 'Month of the Year',
+ * grid: true
+ * }]
+ *
+ */
+