diff --git a/frontends/src/tools/xmlui.py b/frontends/src/tools/xmlui.py
index 3d17b11b..9fe93483 100644
--- a/frontends/src/tools/xmlui.py
+++ b/frontends/src/tools/xmlui.py
@@ -326,6 +326,9 @@ class ValueGetter(object):
     def __getattr__(self, name):
         return self.__getitem__(name)
 
+    def keys(self):
+        return self.widgets.keys()
+
 
 class XMLUIPanel(XMLUIBase):
     """XMLUI Panel