- * Sets up the background image/color based on the current state.
- * This will set the depth index (always), and add to stage if the control is on stage.
+ * @brief Register a visual by Property Index, linking an Actor to controlRenderer when required.
+ * In the case of the visual being an actor or control deeming controlRenderer not required then controlRenderer should be an empty handle.
+ * No parenting is done during registration, this should be done by derived class.