Add implementation for methods that add nodes at a given indexPath or set of indexPaths

Source/GSControllerTreeProxy.m

@@ -57,6 +57,7 @@
   return [children count];
 }
 
+// This is here so that when the path is specified as "children" it responds
 - (NSMutableArray *) children
 {
   NSDictionary *ro = [self representedObject];
@@ -75,5 +76,16 @@
 			 forKey: @"value"];
 }
 
+// These return the value in the cases where the parent class method is called...
+- (NSArray *) childNodes
+{
+  return [self children];
+}
+
+- (NSArray *) mutableChildNodes
+{
+  return [self children];
+}
+
 @end