diff --git a/hurricane/src/hurricane/hurricane/Component.h b/hurricane/src/hurricane/hurricane/Component.h
index 328e865c..077ce774 100644
--- a/hurricane/src/hurricane/hurricane/Component.h
+++ b/hurricane/src/hurricane/hurricane/Component.h
@@ -21,6 +21,7 @@
 #ifndef HURRICANE_COMPONENT_H
 #define HURRICANE_COMPONENT_H
 
+#include  <set>
 #include "hurricane/Points.h"
 #include "hurricane/Go.h"
 #include "hurricane/Components.h"
@@ -170,6 +171,9 @@ namespace Hurricane {
   };
 
 
+  typedef  std::set<Component*,DBo::CompareById>  ComponentSet;
+
+
 } // Hurricane namespace.
 
 
diff --git a/hurricane/src/isobar/hurricane/isobar/PyHurricane.h b/hurricane/src/isobar/hurricane/isobar/PyHurricane.h
index ef985fe7..c1b65258 100644
--- a/hurricane/src/isobar/hurricane/isobar/PyHurricane.h
+++ b/hurricane/src/isobar/hurricane/isobar/PyHurricane.h
@@ -1625,31 +1625,31 @@ extern "C" {
     catch ( const Warning& w ) {                                    \
       std::string message = getString(w);                           \
       PyErr_Warn ( HurricaneWarning, const_cast<char*>(message.c_str()) ); \
-      std::cerr << message << std::endl; \
+      std::cerr << message << std::endl;                            \
     }                                                               \
     catch ( const Error& e ) {                                      \
       std::string message = getString(e);                           \
       if (not e.where().empty()) message += "\n" + e.where();       \
       PyErr_SetString ( HurricaneError, message.c_str() );          \
-      std::cerr << message << std::endl; \
+      std::cerr << message << std::endl;                            \
       return NULL;                                                  \
     }                                                               \
     catch ( const Bug& e ) {                                        \
       std::string message = getString(e);                           \
       PyErr_SetString ( HurricaneError, message.c_str() );          \
-      std::cerr << message << std::endl; \
+      std::cerr << message << std::endl;                            \
       return NULL;                                                  \
     }                                                               \
     catch ( const Exception& e ) {                                  \
       std::string message = "Unknown Hurricane::Exception";         \
       PyErr_SetString ( HurricaneError, message.c_str() );          \
-      std::cerr << message << std::endl; \
+      std::cerr << message << std::endl;                            \
       return NULL;                                                  \
     }                                                               \
     catch ( const std::exception& e )  {                            \
       std::string message = std::string(e.what());                  \
       PyErr_SetString ( HurricaneError, message.c_str() );          \
-      std::cerr << message << std::endl; \
+      std::cerr << message << std::endl;                            \
       return NULL;                                                  \
     }                                                               \
     catch ( ... ) {                                                 \
@@ -1657,7 +1657,7 @@ extern "C" {
         "Unmanaged exception, neither a Hurricane::Error nor"       \
         " a std::exception.";                                       \
       PyErr_SetString ( HurricaneError, message.c_str() );          \
-      std::cerr << message << std::endl; \
+      std::cerr << message << std::endl;                            \
       return NULL;                                                  \
     }                                                               \
 
diff --git a/hurricane/src/viewer/CellWidget.cpp b/hurricane/src/viewer/CellWidget.cpp
index 1540e8c6..02edb928 100644
--- a/hurricane/src/viewer/CellWidget.cpp
+++ b/hurricane/src/viewer/CellWidget.cpp
@@ -2687,6 +2687,31 @@ namespace Hurricane {
   }
 
 
+  void  CellWidget::selectSet ( const ComponentSet& components )
+  {
+    if ( (++_delaySelectionChanged == 1) and not _state->cumulativeSelection() ) {
+      openRefreshSession();
+      unselectAll();
+      closeRefreshSession();
+    }
+
+    bool               selected  = true;
+    // SelectorCriterion* criterion = _state->getSelection().add ( selectArea );
+    // if ( criterion and (not criterion->isEnabled()) ) {
+    //   criterion->enable();
+
+    for ( Component* component : components ) {
+      if (component->getCell() == getCell()) {
+        select( Occurrence( component ));
+      }
+    }
+    // } else
+    //   selected = false;
+
+    if ( (--_delaySelectionChanged == 0) and selected ) emit selectionChanged( _selectors );
+  }
+
+
   void  CellWidget::select ( Occurrence occurrence )
   {
     if ( (++_delaySelectionChanged == 1) and not _state->cumulativeSelection() ) {
@@ -2786,6 +2811,18 @@ namespace Hurricane {
   }
 
 
+  void  CellWidget::unselectSet ( const ComponentSet& components )
+  {
+    ++_delaySelectionChanged;
+    for ( Component* component : components ) {
+      if (component->getCell() == getCell()) {
+        unselect( Occurrence( component ));
+      }
+    }
+    if ( --_delaySelectionChanged == 0 ) emit selectionChanged( _selectors );
+  }
+
+
   void  CellWidget::unselectAll ()
   {
     ++_delaySelectionChanged;
diff --git a/hurricane/src/viewer/hurricane/viewer/CellWidget.h b/hurricane/src/viewer/hurricane/viewer/CellWidget.h
index 60997001..5b277e3f 100644
--- a/hurricane/src/viewer/hurricane/viewer/CellWidget.h
+++ b/hurricane/src/viewer/hurricane/viewer/CellWidget.h
@@ -265,10 +265,12 @@ namespace Hurricane {
       inline  DrawingPlanes&            getDrawingPlanes           ();
            // void                      select                     ( const Net* );
               void                      select                     ( Occurrence );
+              void                      selectSet                  ( const ComponentSet& );
               bool                      isSelected                 ( Occurrence );
               void                      selectOccurrencesUnder     ( Box selectArea );
            // void                      unselect                   ( const Net* );
               void                      unselect                   ( Occurrence );
+              void                      unselectSet                ( const ComponentSet& );
               void                      unselectAll                ();
               void                      toggleSelection            ( Occurrence );
               void                      setShowSelection           ( bool state );