diff --git a/dicom-viewer/src/App.tsx b/dicom-viewer/src/App.tsx
index dc7f8ea..74c1a82 100644
--- a/dicom-viewer/src/App.tsx
+++ b/dicom-viewer/src/App.tsx
@@ -24,6 +24,7 @@ const { IMAGE_RENDERED } = Enums.Events;
 
 const STACK_TOOL_GROUP_ID = 'STACK_TOOL_GROUP_ID';
 const VOLUME_TOOL_GROUP_ID = 'VOLUME_TOOL_GROUP_ID';
+const REFERENCE_TOOL_GROUP_ID = 'REFERENCE_TOOL_GROUP_ID';
 
 // Common CT presets (add more as needed)
 const WINDOW_LEVEL_PRESETS = [
@@ -487,8 +488,8 @@ function App() {
       }
 
       // --- In your setup function, use the correct tool group per viewport ---
-      const { stackToolGroup, volumeToolGroup } = ToolGroupManager.getToolGroup(STACK_TOOL_GROUP_ID)
-        ? { stackToolGroup: ToolGroupManager.getToolGroup(STACK_TOOL_GROUP_ID), volumeToolGroup: ToolGroupManager.getToolGroup(VOLUME_TOOL_GROUP_ID) }
+      const { stackToolGroup, volumeToolGroup, referenceToolGroup } = ToolGroupManager.getToolGroup(STACK_TOOL_GROUP_ID)
+        ? { stackToolGroup: ToolGroupManager.getToolGroup(STACK_TOOL_GROUP_ID), volumeToolGroup: ToolGroupManager.getToolGroup(VOLUME_TOOL_GROUP_ID), referenceToolGroup: ToolGroupManager.getToolGroup(REFERENCE_TOOL_GROUP_ID) }
         : setupTools();
 
 
@@ -498,29 +499,14 @@ function App() {
 
       // --- In your setup function, after tool group creation, enable/disable ReferenceLinesTool for each tool group ---
       if (referenceLinesEnabled) {
-        if (!stackToolGroup.hasTool(ReferenceLinesTool.toolName)) {
-          stackToolGroup.addTool(ReferenceLinesTool.toolName);
-        }
-        if (!volumeToolGroup.hasTool(ReferenceLinesTool.toolName)) {
-          volumeToolGroup.addTool(ReferenceLinesTool.toolName);
-        }
-        // Set the active viewport as the source for reference lines
         const sourceViewportId = `CT_${activeViewport}`;
-        stackToolGroup.setToolConfiguration(ReferenceLinesTool.toolName, {
+        referenceToolGroup.setToolEnabled(ReferenceLinesTool.toolName);
+        referenceToolGroup.setToolConfiguration(ReferenceLinesTool.toolName, {
           sourceViewportId,
         });
-        volumeToolGroup.setToolConfiguration(ReferenceLinesTool.toolName, {
-          sourceViewportId,
-        });
-        stackToolGroup.setToolEnabled(ReferenceLinesTool.toolName);
-        volumeToolGroup.setToolEnabled(ReferenceLinesTool.toolName);
       } else {
-        if (stackToolGroup.hasTool(ReferenceLinesTool.toolName)) {
-          stackToolGroup.setToolDisabled(ReferenceLinesTool.toolName);
-        }
-        if (volumeToolGroup.hasTool(ReferenceLinesTool.toolName)) {
-          volumeToolGroup.setToolDisabled(ReferenceLinesTool.toolName);
-        }
+        referenceToolGroup.setToolDisabled(ReferenceLinesTool.toolName);
+
       }
 
       // 6. Enable and configure each viewport
@@ -560,6 +546,7 @@ function App() {
         // Add tool group only once
         toolGroup.addViewport(viewportId, renderingEngineId);
 
+        referenceToolGroup.addViewport(viewportId, renderingEngineId);
 
 
         const viewport = renderingEngine.getViewport(viewportId);
@@ -1787,7 +1774,7 @@ function setupTools() {
     stackToolGroup.addTool(PlanarFreehandROITool.toolName, { calculateStats: false });
     stackToolGroup.addTool(PlanarFreehandContourSegmentationTool.toolName, {});
     stackToolGroup.addTool(SculptorTool.toolName, {});
-    stackToolGroup.addTool(ReferenceLinesTool.toolName);
+    //stackToolGroup.addTool(ReferenceLinesTool.toolName);
     // StackScrollTool mouse wheel binding
     stackToolGroup.setToolActive(StackScrollTool.toolName, {
       bindings: [{ mouseButton: MouseBindings.Wheel }],
@@ -1811,9 +1798,15 @@ function setupTools() {
     volumeToolGroup.addTool(PlanarFreehandROITool.toolName, { calculateStats: false });
     volumeToolGroup.addTool(PlanarFreehandContourSegmentationTool.toolName, {});
     volumeToolGroup.addTool(SculptorTool.toolName, {});
-    volumeToolGroup.addTool(ReferenceLinesTool.toolName);
+    //volumeToolGroup.addTool(ReferenceLinesTool.toolName);
     //volumeToolGroup.addTool(CrosshairsTool.toolName, {});
   }
 
-  return { stackToolGroup, volumeToolGroup };
+  let referenceToolGroup = ToolGroupManager.getToolGroup(REFERENCE_TOOL_GROUP_ID);
+  if (!referenceToolGroup) {
+    referenceToolGroup = ToolGroupManager.createToolGroup(REFERENCE_TOOL_GROUP_ID);
+    referenceToolGroup.addTool(ReferenceLinesTool.toolName);
+  }
+
+  return { stackToolGroup, volumeToolGroup, referenceToolGroup };
 }