diff --git a/toonz/sources/toonz/frameheadgadget.cpp b/toonz/sources/toonz/frameheadgadget.cpp
index 0e8f1d8..2d9cf03 100644
--- a/toonz/sources/toonz/frameheadgadget.cpp
+++ b/toonz/sources/toonz/frameheadgadget.cpp
@@ -660,43 +660,3 @@ public:
   }
 } onionSkinToggle;
 
-
-class ZeroThickToggle : public MenuItemHandler {
-public:
-	ZeroThickToggle() : MenuItemHandler(MI_ZeroThick) {}
-	void execute() {
-		QAction *action = CommandManager::instance()->getAction(MI_ZeroThick);
-		if (!action)
-			return;
-		bool checked = action->isChecked();
-		enableZeroThick(checked);
-	}
-
-	static void enableZeroThick(bool enable = true)	{
-		Preferences::instance()->setShow0ThickLines(enable);
-		TApp::instance()->getCurrentScene()->notifySceneChanged();
-	}
-} ZeroThickToggle;
-
-
-void ZeroThickToggleGui::addZeroThickCommand(QMenu *menu) {
-	static ZeroThickToggleHandler switcher;
-	if (Preferences::instance()->getShow0ThickLines()) {
-		QAction *hideZeroThick = menu->addAction(QString(QObject::tr("Hide Zero Thickness Lines")));
-		menu->connect(hideZeroThick, SIGNAL(triggered()),
-			&switcher, SLOT(deactivate()));
-	}
-	else {
-		QAction *showZeroThick = menu->addAction(QString(QObject::tr("Show Zero Thickness Lines")));
-		menu->connect(showZeroThick, SIGNAL(triggered()),
-			&switcher, SLOT(activate()));
-	}
-}
-
-void ZeroThickToggleGui::ZeroThickToggleHandler::activate() {
-	ZeroThickToggle::enableZeroThick(true);
-}
-
-void ZeroThickToggleGui::ZeroThickToggleHandler::deactivate() {
-	ZeroThickToggle::enableZeroThick(false);
-}
\ No newline at end of file
diff --git a/toonz/sources/toonz/frameheadgadget.h b/toonz/sources/toonz/frameheadgadget.h
index 3de2db6..0d98993 100644
--- a/toonz/sources/toonz/frameheadgadget.h
+++ b/toonz/sources/toonz/frameheadgadget.h
@@ -87,18 +87,4 @@ public:
   bool eventFilter(QObject *obj, QEvent *event);
 };
 
-namespace ZeroThickToggleGui {
-	void addZeroThickCommand(QMenu* menu);
-
-	class ZeroThickToggleHandler : public QObject {
-		Q_OBJECT
-
-	public slots:
-		void activate();
-		void deactivate();
-	};
-
-
-} //Namespace ZeroThickToggleGui
-
 #endif
diff --git a/toonz/sources/toonz/sceneviewercontextmenu.cpp b/toonz/sources/toonz/sceneviewercontextmenu.cpp
index f6af261..6ea36a1 100644
--- a/toonz/sources/toonz/sceneviewercontextmenu.cpp
+++ b/toonz/sources/toonz/sceneviewercontextmenu.cpp
@@ -7,7 +7,6 @@
 #include "tapp.h"
 #include "menubarcommandids.h"
 #include "onionskinmaskgui.h"
-#include "frameheadgadget.h"
 
 // TnzTools includes
 #include "tools/toolhandle.h"
@@ -26,6 +25,7 @@
 #include "toonz/tframehandle.h"
 #include "toonz/tobjecthandle.h"
 #include "toonz/tstageobjecttree.h"
+#include "toonz/tscenehandle.h"
 #include "toonz/txshcolumn.h"
 #include "toonz/tstageobjectspline.h"
 #include "toonz/tstageobjectid.h"
@@ -392,3 +392,45 @@ void SceneViewerContextMenu::savePreviewedFrames() {
                       SceneViewer::SUBCAMERA_PREVIEW)
       ->saveRenderedFrames();
 }
+
+
+
+class ZeroThickToggle : public MenuItemHandler {
+public:
+	ZeroThickToggle() : MenuItemHandler(MI_ZeroThick) {}
+	void execute() {
+		QAction *action = CommandManager::instance()->getAction(MI_ZeroThick);
+		if (!action)
+			return;
+		bool checked = action->isChecked();
+		enableZeroThick(checked);
+	}
+
+	static void enableZeroThick(bool enable = true)	{
+		Preferences::instance()->setShow0ThickLines(enable);
+		TApp::instance()->getCurrentScene()->notifySceneChanged();
+	}
+} ZeroThickToggle;
+
+
+void ZeroThickToggleGui::addZeroThickCommand(QMenu *menu) {
+	static ZeroThickToggleHandler switcher;
+	if (Preferences::instance()->getShow0ThickLines()) {
+		QAction *hideZeroThick = menu->addAction(QString(QObject::tr("Hide Zero Thickness Lines")));
+		menu->connect(hideZeroThick, SIGNAL(triggered()),
+			&switcher, SLOT(deactivate()));
+	}
+	else {
+		QAction *showZeroThick = menu->addAction(QString(QObject::tr("Show Zero Thickness Lines")));
+		menu->connect(showZeroThick, SIGNAL(triggered()),
+			&switcher, SLOT(activate()));
+	}
+}
+
+void ZeroThickToggleGui::ZeroThickToggleHandler::activate() {
+	ZeroThickToggle::enableZeroThick(true);
+}
+
+void ZeroThickToggleGui::ZeroThickToggleHandler::deactivate() {
+	ZeroThickToggle::enableZeroThick(false);
+}
\ No newline at end of file
diff --git a/toonz/sources/toonz/sceneviewercontextmenu.h b/toonz/sources/toonz/sceneviewercontextmenu.h
index ce656a4..c1fba3b 100644
--- a/toonz/sources/toonz/sceneviewercontextmenu.h
+++ b/toonz/sources/toonz/sceneviewercontextmenu.h
@@ -36,4 +36,18 @@ public slots:
   void onSetCurrent();
 };
 
+namespace ZeroThickToggleGui {
+	void addZeroThickCommand(QMenu* menu);
+
+	class ZeroThickToggleHandler : public QObject {
+		Q_OBJECT
+
+			public slots:
+		void activate();
+		void deactivate();
+	};
+
+
+} //Namespace ZeroThickToggleGui
+
 #endif