+ virtual const std::vector<tree::Node*>& GetSelected(int level){ GimmickError("INTERNAL ERROR : TreeView::GetSelected not overloaded"); }
+
+ /// Gets the next nodes on the list, be it up(true) or down(false).
+ virtual void GetNodes(std::vector<tree::Node*>& nodes, bool direction){ GimmickError("INTERNAL ERROR : TreeView::GetNodes not overloaded"); }