+ * // two values specified
+ * anchor: '-50 -100' // render item the complete width of the container
+ * // minus 50 pixels and
+ * // the complete height minus 100 pixels.
+ * // one value specified
+ * anchor: '-50' // anchor value is assumed to be the right offset value
+ * // bottom offset will default to 0
+ *
+ * - **Sides** : Valid values are `right` (or `r`) and `bottom` (or `b`).
+ *
+ * Either the container must have a fixed size or an anchorSize config value defined at render time in
+ * order for these to have any effect.
+ *
+ * - **Mixed** :
+ *
+ * Anchor values can also be mixed as needed. For example, to render the width offset from the container
+ * right edge by 50 pixels and 75% of the container's height use:
+ *
+ * anchor: '-50 75%'