diff --git a/src/Gui/ViewProvider.cpp b/src/Gui/ViewProvider.cpp
index 2f0e67617..3a1224f50 100644
--- a/src/Gui/ViewProvider.cpp
+++ b/src/Gui/ViewProvider.cpp
@@ -656,3 +656,27 @@ SoSeparator* ViewProvider::getFrontRoot(void) const {
     }
     return nullptr;
 }
+
+std::vector< App::DocumentObject* > ViewProvider::claimChildren(void) const {
+
+    std::vector< App::DocumentObject* > vec;
+    auto vector = getExtensionsDerivedFromType<Gui::ViewProviderExtension>();
+    for(Gui::ViewProviderExtension* ext : vector) {
+        std::vector< App::DocumentObject* > nvec = ext->extensionClaimChildren();
+        if(!nvec.empty())
+            vec.insert(std::end(vec), std::begin(nvec), std::end(nvec));  
+    }
+    return vec;
+}
+
+std::vector< App::DocumentObject* > ViewProvider::claimChildren3D(void) const {
+
+    std::vector< App::DocumentObject* > vec;
+    auto vector = getExtensionsDerivedFromType<Gui::ViewProviderExtension>();
+    for(Gui::ViewProviderExtension* ext : vector) {
+        std::vector< App::DocumentObject* > nvec = ext->extensionClaimChildren3D();
+        if(!nvec.empty())
+            vec.insert(std::end(vec), std::begin(nvec), std::end(nvec));  
+    }
+    return vec;
+}
diff --git a/src/Gui/ViewProvider.h b/src/Gui/ViewProvider.h
index 860657bef..0f02ce1d6 100644
--- a/src/Gui/ViewProvider.h
+++ b/src/Gui/ViewProvider.h
@@ -139,10 +139,7 @@ public:
      * @param subNames  list of selected subelements
      * @return          true if the deletion is approoved by the view provider.
      */
-    virtual bool onDelete(const std::vector<std::string> &subNames) {
-        (void)subNames;
-        return true;
-    }
+    virtual bool onDelete(const std::vector<std::string> &subNames);
     //@}
 
 
diff --git a/src/Gui/ViewProviderDocumentObjectGroup.cpp b/src/Gui/ViewProviderDocumentObjectGroup.cpp
index 32a372d82..6b450b060 100644
--- a/src/Gui/ViewProviderDocumentObjectGroup.cpp
+++ b/src/Gui/ViewProviderDocumentObjectGroup.cpp
@@ -65,8 +65,6 @@ ViewProviderDocumentObjectGroup::~ViewProviderDocumentObjectGroup()
 {
 }
 
-#else
-    Q_UNUSED(prop);
 std::vector<std::string> ViewProviderDocumentObjectGroup::getDisplayModes(void) const
 {
     // empty