diff --git a/src/osgUI/Callbacks.cpp b/src/osgUI/Callbacks.cpp
index bf14e19dc..bac9d5909 100644
--- a/src/osgUI/Callbacks.cpp
+++ b/src/osgUI/Callbacks.cpp
@@ -27,7 +27,10 @@ CloseCallback::CloseCallback(const std::string& callbackName, osgUI::Widget* clo
     setName(callbackName);
 }
 
-CloseCallback::CloseCallback(const CloseCallback& hc, const osg::CopyOp& copyop)
+CloseCallback::CloseCallback(const CloseCallback& hc, const osg::CopyOp& copyop):
+    osg::Object(hc, copyop),
+    osg::Callback(hc, copyop),
+    osg::CallbackObject(hc, copyop)
 {
 }
 
@@ -70,11 +73,13 @@ HandleCallback::HandleCallback()
 }
 
 HandleCallback::HandleCallback(const HandleCallback& hc, const osg::CopyOp& copyop):
+    osg::Object(hc, copyop),
+    osg::Callback(hc, copyop),
     osg::CallbackObject(hc, copyop)
 {
 }
 
-bool HandleCallback::run(osg::Object* object, osg::Parameters& inputParameters, osg::Parameters& outputParameters) const
+bool HandleCallback::run(osg::Object* /*object*/, osg::Parameters& inputParameters, osg::Parameters& outputParameters) const
 {
     if (inputParameters.size()>=2)
     {
@@ -89,7 +94,7 @@ bool HandleCallback::run(osg::Object* object, osg::Parameters& inputParameters,
     return false;
 }
 
-bool HandleCallback::handle(osgGA::EventVisitor* ev, osgGA::Event* event) const
+bool HandleCallback::handle(osgGA::EventVisitor* /*ev*/, osgGA::Event* /*event*/) const
 {
     return false;
 }
@@ -101,6 +106,8 @@ DragCallback::DragCallback():
 }
 
 DragCallback::DragCallback(const DragCallback& hc, const osg::CopyOp& copyop):
+    osg::Object(hc, copyop),
+    osg::Callback(hc, copyop),
     HandleCallback(hc, copyop)
 {
 }
diff --git a/src/osgUI/Dialog.cpp b/src/osgUI/Dialog.cpp
index e3dd23a4e..923f9d859 100644
--- a/src/osgUI/Dialog.cpp
+++ b/src/osgUI/Dialog.cpp
@@ -34,7 +34,7 @@ Dialog::Dialog(const osgUI::Dialog& dialog, const osg::CopyOp& copyop):
 {
 }
 
-bool Dialog::handleImplementation(osgGA::EventVisitor* ev, osgGA::Event* event)
+bool Dialog::handleImplementation(osgGA::EventVisitor* /*ev*/, osgGA::Event* event)
 {
     osgGA::GUIEventAdapter* ea = event->asGUIEventAdapter();
     if (!ea) return false;
diff --git a/src/osgUI/LineEdit.cpp b/src/osgUI/LineEdit.cpp
index 217b77895..9587a148f 100644
--- a/src/osgUI/LineEdit.cpp
+++ b/src/osgUI/LineEdit.cpp
@@ -31,7 +31,7 @@ LineEdit::LineEdit(const osgUI::LineEdit& label, const osg::CopyOp& copyop):
 {
 }
 
-bool LineEdit::handleImplementation(osgGA::EventVisitor* ev, osgGA::Event* event)
+bool LineEdit::handleImplementation(osgGA::EventVisitor* /*ev*/, osgGA::Event* event)
 {
     if (!getHasEventFocus()) return false;
 
diff --git a/src/osgUI/Popup.cpp b/src/osgUI/Popup.cpp
index fc9568cb8..43e5138e0 100644
--- a/src/osgUI/Popup.cpp
+++ b/src/osgUI/Popup.cpp
@@ -30,7 +30,7 @@ Popup::Popup(const osgUI::Popup& dialog, const osg::CopyOp& copyop):
 {
 }
 
-bool Popup::handleImplementation(osgGA::EventVisitor* ev, osgGA::Event* event)
+bool Popup::handleImplementation(osgGA::EventVisitor* /*ev*/, osgGA::Event* event)
 {
 //    OSG_NOTICE<<"Popup::handleImplementation"<<std::endl;
 
diff --git a/src/osgUI/PushButton.cpp b/src/osgUI/PushButton.cpp
index 695f7bf1c..4b70d17b8 100644
--- a/src/osgUI/PushButton.cpp
+++ b/src/osgUI/PushButton.cpp
@@ -30,7 +30,7 @@ PushButton::PushButton(const osgUI::PushButton& pb, const osg::CopyOp& copyop):
 {
 }
 
-bool PushButton::handleImplementation(osgGA::EventVisitor* ev, osgGA::Event* event)
+bool PushButton::handleImplementation(osgGA::EventVisitor* /*ev*/, osgGA::Event* event)
 {
     if (!getHasEventFocus()) return false;
 
diff --git a/src/osgUI/Validator.cpp b/src/osgUI/Validator.cpp
index eb1ab4960..5484ba041 100644
--- a/src/osgUI/Validator.cpp
+++ b/src/osgUI/Validator.cpp
@@ -121,7 +121,7 @@ IntValidator::IntValidator(const IntValidator& validator, const osg::CopyOp& cop
 {
 }
 
-IntValidator::State IntValidator::validateImplementation(std::string& str, int& cursorpos) const
+IntValidator::State IntValidator::validateImplementation(std::string& str, int& /*cursorpos*/) const
 {
     std::string newstring;
     bool canBeNegative = _bottom<0.0;
@@ -205,7 +205,7 @@ DoubleValidator::DoubleValidator(const DoubleValidator& validator, const osg::Co
 {
 }
 
-DoubleValidator::State DoubleValidator::validateImplementation(std::string& str, int& cursorpos) const
+DoubleValidator::State DoubleValidator::validateImplementation(std::string& str, int& /*cursorpos*/) const
 {
     std::string newstring;
     bool canBeNegative = _bottom<0.0;
diff --git a/src/osgUI/Widget.cpp b/src/osgUI/Widget.cpp
index d7a261031..7da623bf9 100644
--- a/src/osgUI/Widget.cpp
+++ b/src/osgUI/Widget.cpp
@@ -299,7 +299,7 @@ bool Widget::handle(osgGA::EventVisitor* ev, osgGA::Event* event)
     return handleImplementation(ev, event);
 }
 
-bool Widget::handleImplementation(osgGA::EventVisitor* ev, osgGA::Event* event)
+bool Widget::handleImplementation(osgGA::EventVisitor* /*ev*/, osgGA::Event* /*event*/)
 {
     return false;
 }