+ SALOMEDS::Study_var aStudy = KERNEL::getStudyServant();
+ // check if reference to study is valid
+ if (CORBA::is_nil(aStudy))
+ return;
+
+ // check if reference to use case builder is valid
+ SALOMEDS::UseCaseBuilder_var useCaseBuilder = aStudy->GetUseCaseBuilder();
+ if (CORBA::is_nil(useCaseBuilder))
+ return;
+
+