diff --git a/src/main/java/de/neemann/digital/core/element/Key.java b/src/main/java/de/neemann/digital/core/element/Key.java
index f8af9c4bd..4c3076994 100644
--- a/src/main/java/de/neemann/digital/core/element/Key.java
+++ b/src/main/java/de/neemann/digital/core/element/Key.java
@@ -92,8 +92,13 @@ public class Key<VALUE> {
         return groupEditAllowed;
     }
 
-    Key<VALUE> setGroupEditAllowed(boolean groupEditAllowed) {
-        this.groupEditAllowed = groupEditAllowed;
+    /**
+     * Allows this attribute in group edit.
+     *
+     * @return this for chained calls
+     */
+    Key<VALUE> allowGroupEdit() {
+        this.groupEditAllowed = true;
         return this;
     }
 
@@ -159,7 +164,7 @@ public class Key<VALUE> {
             setMin(1);
             super.setMax(64);
             setComboBoxValues(VALUES);
-            setGroupEditAllowed(true);
+            allowGroupEdit();
         }
 
         KeyBits setMax(int bits) {
@@ -216,7 +221,7 @@ public class Key<VALUE> {
             names = new String[values.length];
             for (int i = 0; i < values.length; i++)
                 names[i] = Lang.get(getLangKey(values[i]));
-            setGroupEditAllowed(true);
+            allowGroupEdit();
         }
 
         /**
diff --git a/src/main/java/de/neemann/digital/core/element/Keys.java b/src/main/java/de/neemann/digital/core/element/Keys.java
index 70afe6702..ef7c29f38 100644
--- a/src/main/java/de/neemann/digital/core/element/Keys.java
+++ b/src/main/java/de/neemann/digital/core/element/Keys.java
@@ -52,31 +52,31 @@ public final class Keys {
             = new Key.KeyInteger("Size", 1)
             .setComboBoxValues(new Integer[]{1, 2, 3, 4, 5})
             .setMin(1)
-            .setGroupEditAllowed(true);
+            .allowGroupEdit();
 
     /**
      * The value of constants
      */
     public static final Key<Integer> VALUE
-            = new Key<>("Value", 1);
+            = new Key<>("Value", 1).allowGroupEdit();
 
     /**
      * The default value of elements
      */
     public static final Key<Integer> DEFAULT
-            = new Key<>("Default", 0);
+            = new Key<>("Default", 0).allowGroupEdit();
 
     /**
      * The default value of inputs
      */
     public static final Key<InValue> INPUT_DEFAULT
-            = new Key<>("InDefault", new InValue(0));
+            = new Key<>("InDefault", new InValue(0)).allowGroupEdit();
 
     /**
      * Color of LEDs
      */
     public static final Key<java.awt.Color> COLOR
-            = new Key<>("Color", java.awt.Color.RED).setGroupEditAllowed(true);
+            = new Key<>("Color", java.awt.Color.RED).allowGroupEdit();
 
     /**
      * Background Color of nested circuits
@@ -120,19 +120,19 @@ public final class Keys {
      * indicates a diode as blown fuse or as programmed
      */
     public static final Key<Boolean> BLOWN
-            = new Key<>("Blown", false).setGroupEditAllowed(true);
+            = new Key<>("Blown", false).allowGroupEdit();
 
     /**
      * indicates a switch as closed or not
      */
     public static final Key<Boolean> CLOSED
-            = new Key<>("Closed", false).setGroupEditAllowed(true);
+            = new Key<>("Closed", false).allowGroupEdit();
 
     /**
      * signed flag for comparator element
      */
     public static final Key<Boolean> SIGNED
-            = new Key<>("Signed", false).setGroupEditAllowed(true);
+            = new Key<>("Signed", false).allowGroupEdit();
 
     /**
      * the data key for memory
@@ -144,7 +144,7 @@ public final class Keys {
      * flag for flipping selector pos in muxers, decoders and drivers
      */
     public static final Key<Boolean> FLIP_SEL_POSITON
-            = new Key<>("flipSelPos", false);
+            = new Key<>("flipSelPos", false).allowGroupEdit();
 
     /**
      * the rotation of the elements
@@ -184,7 +184,7 @@ public final class Keys {
      * flag to make a value a probe
      */
     public static final Key<Boolean> VALUE_IS_PROBE
-            = new Key<>("valueIsProbe", false).setGroupEditAllowed(true);
+            = new Key<>("valueIsProbe", false).allowGroupEdit();
 
     /**
      * flag to set a ROM as program memory
@@ -233,7 +233,7 @@ public final class Keys {
      * flag to enable high z mode at an input
      */
     public static final Key<Boolean> IS_HIGH_Z
-            = new Key<>("isHighZ", false);
+            = new Key<>("isHighZ", false).allowGroupEdit();
 
     /**
      * flag to enable realtime mode at a clock
@@ -302,7 +302,7 @@ public final class Keys {
      * flag used by a relay to indicate if it is normally open or normally closed.
      */
     public static final Key<Boolean> RELAY_NORMALLY_CLOSED
-            = new Key<>("relayNormallyClosed", false);
+            = new Key<>("relayNormallyClosed", false).allowGroupEdit();
 
     /**
      * flag used by a barrelshifter to indicate if data are rotated
@@ -326,13 +326,13 @@ public final class Keys {
      * Used to indicate if the 7-seg display has a common cathode output
      */
     public static final Key<Boolean> COMMON_CATHODE
-            = new Key<>("commonCathode", false);
+            = new Key<>("commonCathode", false).allowGroupEdit();
 
     /**
      * Used to enable the storage of the last state in the Seven Seg display.
      */
     public static final Key<Boolean> LED_PERSISTENCE
-            = new Key<>("ledPersistence", false).setGroupEditAllowed(true);
+            = new Key<>("ledPersistence", false).allowGroupEdit();
 
     /**
      * Fitter for the atf1502
@@ -409,7 +409,7 @@ public final class Keys {
      * true if component is active low
      */
     public static final Key<Boolean> ACTIVE_LOW
-            = new Key<>("activeLow", false).setGroupEditAllowed(true);
+            = new Key<>("activeLow", false).allowGroupEdit();
 
     /**
      * Fitter for the atf1502