fix regression with menu captions

plugins/c9.ide.ui/lib/menu/menu.js

@@ -1030,6 +1030,7 @@ apf.divider = function(struct, tagName) {
     this.minwidth = 0;
     this.minheight = 0;
 
+    this.implement(apf.ChildValue);
     this.$childProperty = "caption";
     
     //@todo apf3.0 fix this
@@ -1124,6 +1125,8 @@ apf.item = function(struct, tagName) {
 
 (function() {
     this.$focussable = false;
+    
+    this.implement(apf.ChildValue);
     this.$childProperty = "caption";
     this.$canLeechSkin = "item";