Layer GetRootLayer() const;
/**
+ * @brief Returns the overlay Layer of the Window.
+ * If there isn't overlay layer yet, this method create overlay layer and
+ * exclusive render task internally.
+ *
+ * @SINCE_2_2.10
+ * @return The root layer
+ */
+ Layer GetOverlayLayer();
+
+ /**
* @brief Queries the number of on-scene layers in the Window.
*
* Note that a default layer is always provided (count >= 1).