Node representing a (sub)menu in the menu tree structure.
the optional label for this specific node.
Menu nodes are sorted in ascending order based on their sortString.
Inserts the given node at the position indicated by sortString.
a disposable which, when called, will remove the given node again.
Removes the first node with the given id.
Indicates whether the given node is the special navigation menu.
the menu node to check.
true when the given node is a CompositeMenuNode with id navigation,