Gets or sets a property path that that specifies how to get the key for "container" or group node data of a node data object.
public string GroupNodePath {get; set;}
Property Value
This defaults to an empty string, meaning not to call
FindGroupKeyForNode. Otherwise that method is called to try to find the container node for each node. A null value may be used to indicate that there is no property path but that
FindGroupKeyForNode should still be called because it has been overridden.