diff --git a/vmmd b/vmmd
index 1e40568..44ce71a 100755
--- a/vmmd
+++ b/vmmd
@@ -600,6 +600,9 @@ class DbObject:
     def values(self):
         return self._dict.values()
 
+    def __contains__(self, name):
+        return name in self._dict
+
     def __getitem__(self, name):
         return self._dict[name]