Network: fixed top item creation, sort entries.

* Need a way to access the NetworkWindow object from a static
  method in order to sort all entries correctly, though.

headers/os/add-ons/network_settings/NetworkSettingsAddOn.h

@@ -92,6 +92,8 @@ public:
 									BNetworkSettings& settings);
 								~BNetworkInterfaceListItem();
 
+			const char*			Label() const;
+
 	virtual	void				DrawItem(BView* owner,
 									BRect bounds, bool complete);
 	virtual	void				Update(BView* owner, const BFont* font);