diff --git a/include/osgManipulator/Dragger b/include/osgManipulator/Dragger
index 9a099692d..74c052e9b 100644
--- a/include/osgManipulator/Dragger
+++ b/include/osgManipulator/Dragger
@@ -220,6 +220,9 @@ class OSGMANIPULATOR_EXPORT Dragger : public osg::MatrixTransform
         void setActivationModKeyMask(unsigned int mask) { _activationModKeyMask = mask; }
         unsigned int getActivationModKeyMask() const { return _activationModKeyMask; }
 
+        void setActivationMouseButtonMask(unsigned int mask) { _activationMouseButtonMask = mask; }
+        unsigned int getActivationMouseButtonMask() const { return _activationMouseButtonMask; }
+
         void setActivationKeyEvent(int key) { _activationKeyEvent = key; }
         int getActivationKeyEvent() const { return _activationKeyEvent; }
 
@@ -278,8 +281,10 @@ class OSGMANIPULATOR_EXPORT Dragger : public osg::MatrixTransform
         bool                            _draggerActive;
 
         unsigned int                    _activationModKeyMask;
+        unsigned int                    _activationMouseButtonMask;
         int                             _activationKeyEvent;
         bool                            _activationPermittedByModKeyMask;
+        bool                            _activationPermittedByMouseButtonMask;
         bool                            _activationPermittedByKeyEvent;
 
         osgManipulator::PointerInfo     _pointer;
diff --git a/src/osgManipulator/Dragger.cpp b/src/osgManipulator/Dragger.cpp
index b667ca599..3f48e1d22 100644
--- a/src/osgManipulator/Dragger.cpp
+++ b/src/osgManipulator/Dragger.cpp
@@ -166,8 +166,10 @@ Dragger::Dragger() :
     _handleEvents(false),
     _draggerActive(false),
     _activationModKeyMask(0),
+    _activationMouseButtonMask(0),
     _activationKeyEvent(0),
     _activationPermittedByModKeyMask(false),
+    _activationPermittedByMouseButtonMask(false),
     _activationPermittedByKeyEvent(false),
     _intersectionMask(0xffffffff)
 {
@@ -183,12 +185,13 @@ Dragger::Dragger(const Dragger& rhs, const osg::CopyOp& copyop):
     _handleEvents(rhs._handleEvents),
     _draggerActive(false),
     _activationModKeyMask(rhs._activationModKeyMask),
+    _activationMouseButtonMask(rhs._activationMouseButtonMask),
     _activationKeyEvent(rhs._activationKeyEvent),
     _activationPermittedByModKeyMask(false),
+    _activationPermittedByMouseButtonMask(false),
     _activationPermittedByKeyEvent(false),
     _intersectionMask(0xffffffff)
 {
-    OSG_NOTICE<<"CompositeDragger::CompositeDragger(const CompositeDragger& rhs, const osg::CopyOp& copyop) not Implemented yet."<<std::endl;
 }
 
 Dragger::~Dragger()
@@ -322,12 +325,16 @@ bool Dragger::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&
     bool handled = false;
 
     bool activationPermitted = true;
-    if (_activationModKeyMask!=0 || _activationKeyEvent!=0)
+    if (_activationModKeyMask!=0 || _activationMouseButtonMask!=0 || _activationKeyEvent!=0)
     {
         _activationPermittedByModKeyMask = (_activationModKeyMask!=0) ?
             ((ea.getModKeyMask() & _activationModKeyMask)!=0) :
             false;
 
+        _activationPermittedByMouseButtonMask = (_activationMouseButtonMask!=0) ?
+            ((ea.getButtonMask() & _activationMouseButtonMask)!=0) :
+            false;
+
         if (_activationKeyEvent!=0)
         {
             switch (ea.getEventType())
@@ -347,7 +354,7 @@ bool Dragger::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&
             }
         }
 
-        activationPermitted =  _activationPermittedByModKeyMask || _activationPermittedByKeyEvent;
+        activationPermitted =  _activationPermittedByModKeyMask || _activationPermittedByMouseButtonMask || _activationPermittedByKeyEvent;
 
     }