diff --git a/src/SMESH/SMESH_HypoFilter.hxx b/src/SMESH/SMESH_HypoFilter.hxx
index 0fb043e57..fc98428f5 100644
--- a/src/SMESH/SMESH_HypoFilter.hxx
+++ b/src/SMESH/SMESH_HypoFilter.hxx
@@ -78,6 +78,8 @@ class SMESH_EXPORT SMESH_HypoFilter: public SMESH_HypoPredicate
   static SMESH_HypoPredicate* HasDim(const int theDim);
   static SMESH_HypoPredicate* HasType(const int theHypType);
 
+  bool IsEmpty() const { return myPredicates.empty(); }
+
   /*!
    * \brief check aHyp or/and aShape it is assigned to
    */
diff --git a/src/SMESH/SMESH_Hypothesis.cxx b/src/SMESH/SMESH_Hypothesis.cxx
index 8210f156d..9ababf9e4 100644
--- a/src/SMESH/SMESH_Hypothesis.cxx
+++ b/src/SMESH/SMESH_Hypothesis.cxx
@@ -151,6 +151,24 @@ void SMESH_Hypothesis::SetLibName(const char* theLibName)
   _libName = string(theLibName);
 }
 
+//=======================================================================
+//function : GetMeshByPersistentID
+//purpose  : Find a mesh with given persistent ID
+//=======================================================================
+
+SMESH_Mesh* SMESH_Hypothesis::GetMeshByPersistentID(int id)
+{
+  StudyContextStruct* myStudyContext = _gen->GetStudyContext(_studyId);
+  map<int, SMESH_Mesh*>::iterator itm = itm = myStudyContext->mapMesh.begin();
+  for ( ; itm != myStudyContext->mapMesh.end(); itm++)
+  {
+    SMESH_Mesh* mesh = (*itm).second;
+    if ( mesh->GetMeshDS()->GetPersistentId() == id )
+      return mesh;
+  }
+  return 0;
+}
+
 //=============================================================================
 /*!
  *