diff --git a/apps/opencs/view/render/instancemode.cpp b/apps/opencs/view/render/instancemode.cpp
index ff49e0286e..4b6b2e41f8 100644
--- a/apps/opencs/view/render/instancemode.cpp
+++ b/apps/opencs/view/render/instancemode.cpp
@@ -9,7 +9,6 @@
 #include "../../model/world/idtree.hpp"
 #include "../../model/world/commands.hpp"
 
-
 #include "../widget/scenetoolbar.hpp"
 #include "../widget/scenetoolmode.hpp"
 
@@ -52,7 +51,7 @@ void CSVRender::InstanceMode::activate (CSVWidget::SceneToolbar *toolbar)
     }
 
     if (!mSelectionMode)
-        mSelectionMode = new InstanceSelectionMode (toolbar);
+        mSelectionMode = new InstanceSelectionMode (toolbar, getWorldspaceWidget());
 
     EditMode::activate (toolbar);
 
diff --git a/apps/opencs/view/render/instanceselectionmode.cpp b/apps/opencs/view/render/instanceselectionmode.cpp
index 9fd8259991..794a150d20 100644
--- a/apps/opencs/view/render/instanceselectionmode.cpp
+++ b/apps/opencs/view/render/instanceselectionmode.cpp
@@ -1,8 +1,25 @@
 
 #include "instanceselectionmode.hpp"
 
-CSVRender::InstanceSelectionMode::InstanceSelectionMode (CSVWidget::SceneToolbar *parent)
-: CSVWidget::SceneToolMode (parent, "Selection Mode")
+#include <QMenu>
+#include <QAction>
+
+#include "worldspacewidget.hpp"
+
+bool CSVRender::InstanceSelectionMode::createContextMenu (QMenu *menu)
+{
+    if (menu)
+    {
+        menu->addAction (mSelectAll);
+        menu->addAction (mDeselectAll);
+    }
+
+    return true;
+}
+
+CSVRender::InstanceSelectionMode::InstanceSelectionMode (CSVWidget::SceneToolbar *parent,
+    WorldspaceWidget& worldspaceWidget)
+: CSVWidget::SceneToolMode (parent, "Selection Mode"), mWorldspaceWidget (worldspaceWidget)
 {
     addButton (":placeholder", "cube-centre",
         "Centred cube"
@@ -24,4 +41,20 @@ CSVRender::InstanceSelectionMode::InstanceSelectionMode (CSVWidget::SceneToolbar
         "<li>If context selection mode is enabled, a drag with primary/secondary edit not starting on an instance will have the same effect</li>"
         "</ul>"
         "<font color=Red>Not implemented yet</font color>");
+
+    mSelectAll = new QAction ("Select all Instances", this);
+    mDeselectAll = new QAction ("Clear selection", this);
+
+    connect (mSelectAll, SIGNAL (triggered ()), this, SLOT (selectAll()));
+    connect (mDeselectAll, SIGNAL (triggered ()), this, SLOT (clearSelection()));
+}
+
+void CSVRender::InstanceSelectionMode::selectAll()
+{
+    mWorldspaceWidget.selectAll (Mask_Reference);
+}
+
+void CSVRender::InstanceSelectionMode::clearSelection()
+{
+    mWorldspaceWidget.clearSelection (Mask_Reference);
 }
diff --git a/apps/opencs/view/render/instanceselectionmode.hpp b/apps/opencs/view/render/instanceselectionmode.hpp
index e823de2135..6b3a4e37da 100644
--- a/apps/opencs/view/render/instanceselectionmode.hpp
+++ b/apps/opencs/view/render/instanceselectionmode.hpp
@@ -3,16 +3,37 @@
 
 #include "../widget/scenetoolmode.hpp"
 
+class QAction;
+
 namespace CSVRender
 {
+    class WorldspaceWidget;
+
     class InstanceSelectionMode : public CSVWidget::SceneToolMode
     {
             Q_OBJECT
 
+            WorldspaceWidget& mWorldspaceWidget;
+            QAction *mSelectAll;
+            QAction *mDeselectAll;
+
+            /// Add context menu items to \a menu.
+            ///
+            /// \attention menu can be a 0-pointer
+            ///
+            /// \return Have there been any menu items to be added (if menu is 0 and there
+            /// items to be added, the function must return true anyway.
+            virtual bool createContextMenu (QMenu *menu);
+
         public:
 
-            InstanceSelectionMode (CSVWidget::SceneToolbar *parent);
+            InstanceSelectionMode (CSVWidget::SceneToolbar *parent, WorldspaceWidget& worldspaceWidget);
 
+        private slots:
+
+            void selectAll();
+
+            void clearSelection();
     };
 }
 
diff --git a/apps/opencs/view/render/pagedworldspacewidget.cpp b/apps/opencs/view/render/pagedworldspacewidget.cpp
index 1880beab8b..ccb3efb1d6 100644
--- a/apps/opencs/view/render/pagedworldspacewidget.cpp
+++ b/apps/opencs/view/render/pagedworldspacewidget.cpp
@@ -509,6 +509,15 @@ void CSVRender::PagedWorldspaceWidget::clearSelection (int elementMask)
     flagAsModified();
 }
 
+void CSVRender::PagedWorldspaceWidget::selectAll (int elementMask)
+{
+    for (std::map<CSMWorld::CellCoordinates, Cell *>::iterator iter = mCells.begin();
+        iter!=mCells.end(); ++iter)
+        iter->second->setSelection (elementMask, Cell::Selection_All);
+
+    flagAsModified();
+}
+
 std::string CSVRender::PagedWorldspaceWidget::getCellId (const osg::Vec3f& point) const
 {
     const int cellSize = 8192;
diff --git a/apps/opencs/view/render/pagedworldspacewidget.hpp b/apps/opencs/view/render/pagedworldspacewidget.hpp
index 647341d1f4..3f9e605af9 100644
--- a/apps/opencs/view/render/pagedworldspacewidget.hpp
+++ b/apps/opencs/view/render/pagedworldspacewidget.hpp
@@ -98,6 +98,9 @@ namespace CSVRender
             /// \param elementMask Elements to be affected by the clear operation
             virtual void clearSelection (int elementMask);
 
+            /// \param elementMask Elements to be affected by the select operation
+            virtual void selectAll (int elementMask);
+
             virtual std::string getCellId (const osg::Vec3f& point) const;
 
         protected:
diff --git a/apps/opencs/view/render/unpagedworldspacewidget.cpp b/apps/opencs/view/render/unpagedworldspacewidget.cpp
index dad37c946b..48180f8665 100644
--- a/apps/opencs/view/render/unpagedworldspacewidget.cpp
+++ b/apps/opencs/view/render/unpagedworldspacewidget.cpp
@@ -108,6 +108,12 @@ void CSVRender::UnpagedWorldspaceWidget::clearSelection (int elementMask)
     flagAsModified();
 }
 
+void CSVRender::UnpagedWorldspaceWidget::selectAll (int elementMask)
+{
+    mCell->setSelection (elementMask, Cell::Selection_All);
+    flagAsModified();
+}
+
 std::string CSVRender::UnpagedWorldspaceWidget::getCellId (const osg::Vec3f& point) const
 {
     return mCellId;
diff --git a/apps/opencs/view/render/unpagedworldspacewidget.hpp b/apps/opencs/view/render/unpagedworldspacewidget.hpp
index 70a20c216d..8971f22a84 100644
--- a/apps/opencs/view/render/unpagedworldspacewidget.hpp
+++ b/apps/opencs/view/render/unpagedworldspacewidget.hpp
@@ -46,6 +46,9 @@ namespace CSVRender
             /// \param elementMask Elements to be affected by the clear operation
             virtual void clearSelection (int elementMask);
 
+            /// \param elementMask Elements to be affected by the select operation
+            virtual void selectAll (int elementMask);
+
             virtual std::string getCellId (const osg::Vec3f& point) const;
 
         private:
diff --git a/apps/opencs/view/render/worldspacewidget.hpp b/apps/opencs/view/render/worldspacewidget.hpp
index 7a77edad42..13e66b7f03 100644
--- a/apps/opencs/view/render/worldspacewidget.hpp
+++ b/apps/opencs/view/render/worldspacewidget.hpp
@@ -127,6 +127,9 @@ namespace CSVRender
             /// \param elementMask Elements to be affected by the clear operation
             virtual void clearSelection (int elementMask) = 0;
 
+            /// \param elementMask Elements to be affected by the select operation
+            virtual void selectAll (int elementMask) = 0;
+
             /// Return the next intersection point with scene elements matched by
             /// \a interactionMask based on \a localPos and the camera vector.
             /// If there is no such point, instead a point "in front" of \a localPos will be