Load base class data explicitly in subclasses

templates/classdefinition.inc

@@ -20,6 +20,9 @@
         {{ initializers }}
     {
         {{ member.body }}
+        {% for item in class.inheritance %}{% if item.type.isIntrospected %}
+        {{ item.type.fullName }}::Load(data);
+        {% endif %}{% endfor %}
         LoadOwnData(data);
     }