+ virtual const std::vector< std::shared_ptr<RowItem> >&
+ child_items() const;
+
+ /**
+ * Clears the list of child items.
+ */
+ void clear_child_items();
+
+ /**
+ * Adds a child item to this object.
+ */
+ void add_child_item(std::shared_ptr<RowItem> item);
+
+ /**
+ * Removes a child item from this object.
+ */
+ void remove_child_item(std::shared_ptr<RowItem> item);