diff --git a/AlgebraicDataflowArchitectureModel/src/application/views/NavigationWindow.java b/AlgebraicDataflowArchitectureModel/src/application/views/NavigationWindow.java
index 07787f9..cddad6c 100644
--- a/AlgebraicDataflowArchitectureModel/src/application/views/NavigationWindow.java
+++ b/AlgebraicDataflowArchitectureModel/src/application/views/NavigationWindow.java
@@ -13,10 +13,13 @@
 import java.awt.event.ActionListener;
 
 public class NavigationWindow extends JDialog implements IStageChangeListener {
-    private String title = "Navigation";
-    private Editor editor;
-    private JToggleButton dataFlowModelingButton;
-    private JToggleButton pushPullSelectionButton;
+
+    private static final String TITLE = "Navigation";
+    private final Editor editor;
+
+    private final JToggleButton dataFlowModelingButton;
+    private final JToggleButton pushPullSelectionButton;
+
     private boolean forbidReentry = false;
 
     public NavigationWindow(ApplicationWindow owner, Editor editor) {
@@ -29,7 +32,7 @@
         pushPullSelectionButton.setEnabled(false);
         dataFlowModelingButton.setSelected(true);
 
-        setTitle(title);
+        setTitle(TITLE);
         setDefaultCloseOperation(HIDE_ON_CLOSE);
         Container panel = getContentPane();
         panel.setLayout(new GridLayout(2, 1));