--- a/Applications/Qt/QCairoWidget.cpp	Wed Nov 27 17:56:48 2019 +0100
+++ b/Applications/Qt/QCairoWidget.cpp	Thu Nov 28 18:28:15 2019 +0100
@@ -185,6 +185,16 @@
       break;
     }
   }
+  else if (keyChar == 127)
+  {
+    switch (event->key())
+    {
+      CASE_QT_KEY_TO_ORTHANC(Qt::Key_Delete, KeyboardKeys_Delete);
+      CASE_QT_KEY_TO_ORTHANC(Qt::Key_Backspace, KeyboardKeys_Backspace);
+    default:
+      break;
+    }
+  }
 
   {
     OrthancStone::NativeStoneApplicationContext::GlobalMutexLocker locker(*context_);    

--- a/Applications/Sdl/SdlEngine.cpp	Wed Nov 27 17:56:48 2019 +0100
+++ b/Applications/Sdl/SdlEngine.cpp	Thu Nov 28 18:28:15 2019 +0100
@@ -257,6 +257,10 @@
           case SDLK_KP_MINUS:
             locker.GetCentralViewport().KeyPressed(KeyboardKeys_Generic, '-', modifiers);  break;
 
+          case SDLK_DELETE:
+            locker.GetCentralViewport().KeyPressed(KeyboardKeys_Delete, 0, modifiers);  break;
+          case SDLK_BACKSPACE:
+            locker.GetCentralViewport().KeyPressed(KeyboardKeys_Backspace, 0, modifiers);  break;
           case SDLK_RIGHT:
             locker.GetCentralViewport().KeyPressed(KeyboardKeys_Right, 0, modifiers);  break;
           case SDLK_LEFT:

--- a/Framework/Radiography/RadiographyScene.cpp	Wed Nov 27 17:56:48 2019 +0100
+++ b/Framework/Radiography/RadiographyScene.cpp	Thu Nov 28 18:28:15 2019 +0100
@@ -136,7 +136,7 @@
 
     // LOG(INFO) << "Registering layer: " << countLayers_;
 
-    size_t index = countLayers_++;
+    size_t index = nextLayerIndex_++;
     raii->SetIndex(index);
     layers_[index] = raii.release();
 
@@ -165,7 +165,7 @@
   RadiographyScene::RadiographyScene(MessageBroker& broker) :
     IObserver(broker),
     IObservable(broker),
-    countLayers_(0),
+    nextLayerIndex_(0),
     hasWindowing_(false),
     windowingCenter_(0),  // Dummy initialization
     windowingWidth_(0)    // Dummy initialization
@@ -221,9 +221,8 @@
       delete found->second;
       
       layers_.erase(found);
-      countLayers_--;
       
-      LOG(INFO) << "Removing layer, there are now : " << countLayers_ << " layers";
+      LOG(INFO) << "Removing layer, there are now : " << layers_.size() << " layers";
 
       BroadcastMessage(RadiographyScene::LayerRemovedMessage(*this, layerIndex));
     }
@@ -294,7 +293,10 @@
       alpha->SetGeometry(*geometry);
     }
 
-    return RegisterLayer(alpha.release());
+    RadiographyLayer& registeredLayer = RegisterLayer(alpha.release());
+
+    BroadcastMessage(RadiographyScene::LayerEditedMessage(*this, registeredLayer));
+    return registeredLayer;
   }
 
 
@@ -513,7 +515,7 @@
                                 bool applyWindowing) const
   {
     // Render layers in the background-to-foreground order
-    for (size_t index = 0; index < countLayers_; index++)
+    for (size_t index = 0; index < nextLayerIndex_; index++)
     {
       Layers::const_iterator it = layers_.find(index);
       if (it != layers_.end())
@@ -530,7 +532,7 @@
                                      double y) const
   {
     // Render layers in the foreground-to-background order
-    for (size_t i = countLayers_; i > 0; i--)
+    for (size_t i = nextLayerIndex_; i > 0; i--)
     {
       index = i - 1;
       Layers::const_iterator it = layers_.find(index);

--- a/Framework/Radiography/RadiographyScene.h	Wed Nov 27 17:56:48 2019 +0100
+++ b/Framework/Radiography/RadiographyScene.h	Thu Nov 28 18:28:15 2019 +0100
@@ -161,7 +161,7 @@
   protected:
     typedef std::map<size_t, RadiographyLayer*>  Layers;
 
-    size_t  countLayers_;
+    size_t  nextLayerIndex_;
     bool    hasWindowing_;
     float   windowingCenter_;
     float   windowingWidth_;

--- a/Framework/Radiography/RadiographyWidget.cpp	Wed Nov 27 17:56:48 2019 +0100
+++ b/Framework/Radiography/RadiographyWidget.cpp	Thu Nov 28 18:28:15 2019 +0100
@@ -184,34 +184,6 @@
     selectedLayer_ = layer;
   }
 
-  void RadiographyWidget::ClearSelectedLayer()
-  {
-    hasSelection_ = false;
-  }
-
-  bool RadiographyWidget::SelectMaskLayer(size_t index)
-  {
-    std::vector<size_t> layerIndexes;
-    size_t count = 0;
-    scene_->GetLayersIndexes(layerIndexes);
-
-    for (size_t i = 0; i < layerIndexes.size(); ++i)
-    {
-      const RadiographyMaskLayer* maskLayer = dynamic_cast<const RadiographyMaskLayer*>(&(scene_->GetLayer(layerIndexes[i])));
-      if (maskLayer != NULL)
-      {
-        if (count == index)
-        {
-          Select(layerIndexes[i]);
-          return true;
-        }
-        count++;
-      }
-    }
-
-    return false;
-  }
-
   bool RadiographyWidget::LookupSelectedLayer(size_t& layer)
   {
     if (hasSelection_)
@@ -244,8 +216,9 @@
     size_t removedLayerIndex = message.GetLayerIndex();
     if (hasSelection_ && selectedLayer_ == removedLayerIndex)
     {
-      ClearSelectedLayer();
+      Unselect();
     }
+    NotifyContentChanged();
   }
   
   void RadiographyWidget::SetInvert(bool invert)

--- a/Framework/Radiography/RadiographyWidget.h	Wed Nov 27 17:56:48 2019 +0100
+++ b/Framework/Radiography/RadiographyWidget.h	Thu Nov 28 18:28:15 2019 +0100
@@ -71,16 +71,14 @@
 
     void SetScene(boost::shared_ptr<RadiographyScene> scene);
 
+    void Select(size_t layer);
+
     void Unselect()
     {
       hasSelection_ = false;
     }
 
-    void Select(size_t layer);
-
-    void ClearSelectedLayer();
-
-    bool SelectMaskLayer(size_t index = 0);
+    template<typename LayerType> bool SelectLayerByType(size_t index = 0);
 
     bool LookupSelectedLayer(size_t& layer);
 
@@ -106,4 +104,27 @@
       return interpolation_;
     }
   };
+
+  template<typename LayerType> bool RadiographyWidget::SelectLayerByType(size_t index)
+  {
+    std::vector<size_t> layerIndexes;
+    size_t count = 0;
+    scene_->GetLayersIndexes(layerIndexes);
+
+    for (size_t i = 0; i < layerIndexes.size(); ++i)
+    {
+      const LayerType* typedLayer = dynamic_cast<const LayerType*>(&(scene_->GetLayer(layerIndexes[i])));
+      if (typedLayer != NULL)
+      {
+        if (count == index)
+        {
+          Select(layerIndexes[i]);
+          return true;
+        }
+        count++;
+      }
+    }
+
+    return false;
+  }
 }

--- a/Framework/StoneEnumerations.h	Wed Nov 27 17:56:48 2019 +0100
+++ b/Framework/StoneEnumerations.h	Thu Nov 28 18:28:15 2019 +0100
@@ -95,10 +95,12 @@
     KeyboardKeys_Generic = 0,
 
     // let's use the same ids as in javascript to avoid some conversion in WASM: https://css-tricks.com/snippets/javascript/javascript-keycodes/
+    KeyboardKeys_Backspace = 8,
     KeyboardKeys_Left = 37,
     KeyboardKeys_Up = 38,
     KeyboardKeys_Right = 39,
-    KeyboardKeys_Down = 40
+    KeyboardKeys_Down = 40,
+    KeyboardKeys_Delete = 46
   };
 
   enum SopClassUid