Compound scripts have direct editing disabled - it might damage script initializer to edit it separately.

src/com/jpexs/decompiler/flash/gui/MainPanel.java

@@ -5140,6 +5140,7 @@ public final class MainPanel extends JPanel implements TreeSelectionListener, Se
                 abcPanel.setAbc(scriptLeaf.abc);
                 abcPanel.decompiledTextArea.setScript(scriptLeaf, true);
                 abcPanel.decompiledTextArea.setNoTrait();
+                abcPanel.setCompound(true);
             }
 
             if (Configuration.displayAs3TraitsListAndConstantsPanel.get()) {
@@ -5156,6 +5157,7 @@ public final class MainPanel extends JPanel implements TreeSelectionListener, Se
                 abcPanel.setAbc(scriptLeaf.abc);
                 abcPanel.decompiledTextArea.setScript(scriptLeaf, true);
                 abcPanel.decompiledTextArea.setNoTrait();
+                abcPanel.setCompound(!scriptLeaf.isSimple);
             }
 
             if (Configuration.displayAs3TraitsListAndConstantsPanel.get()) {

src/com/jpexs/decompiler/flash/gui/abc/ABCPanel.java

@@ -203,6 +203,8 @@ public class ABCPanel extends JPanel implements ItemListener, SearchListener<Scr
     private final DebugPanel debugPanel;
 
     private final JLabel experimentalLabel = new JLabel(AppStrings.translate("action.edit.experimental"));
+    
+    private final JLabel infoNotEditableLabel;
 
     private final JButton editDecompiledButton = new JButton(AppStrings.translate("button.edit.script.decompiled"), View.getIcon("edit16"));
 
@@ -1065,14 +1067,20 @@ public class ABCPanel extends JPanel implements ItemListener, SearchListener<Scr
 
         brokenHintPanel.setVisible(false);
 
+        infoNotEditableLabel = new JLabel(View.getIcon("information16"));
+        infoNotEditableLabel.setToolTipText(AppStrings.translate("info.noteditable.compound"));        
+        
         iconDecPanel.add(panelWithHint, BorderLayout.CENTER);
         final JPanel decButtonsPan = new JPanel(new FlowLayout());
         decButtonsPan.setBorder(new BevelBorder(BevelBorder.RAISED));
         decButtonsPan.add(editDecompiledButton);
         decButtonsPan.add(experimentalLabel);
+        decButtonsPan.add(infoNotEditableLabel);
         decButtonsPan.add(saveDecompiledButton);
         decButtonsPan.add(cancelDecompiledButton);
 
+        infoNotEditableLabel.setVisible(false);
+        
         editDecompiledButton.setMargin(new Insets(3, 3, 3, 10));
         saveDecompiledButton.setMargin(new Insets(3, 3, 3, 10));
         cancelDecompiledButton.setMargin(new Insets(3, 3, 3, 10));
@@ -1993,4 +2001,10 @@ public class ABCPanel extends JPanel implements ItemListener, SearchListener<Scr
     public DebugPanel getDebugPanel() {
         return debugPanel;
     }
+    
+    public void setCompound(boolean value) {
+        infoNotEditableLabel.setVisible(value);
+        experimentalLabel.setVisible(!value);
+        editDecompiledButton.setEnabled(!value);
+    }
 }

src/com/jpexs/decompiler/flash/gui/locales/MainFrame.properties

@@ -1150,3 +1150,5 @@ warning.icon = Click to show related warning
 button.export = Export
 
 error.font.cannotaddcharacter = ERROR: Cannot add more characters to the font.\r\nSuccessfully added characters: %numchars%.
+
+info.noteditable.compound = The script is compound - has multiple externally visible definitions. The direct editing is not available.