diff --git a/gs-carcolor/src/main/java/org/genericsystem/carcolor/CarColorApp.java b/gs-carcolor/src/main/java/org/genericsystem/carcolor/CarColorApp.java
index 28d0528c1..abc0ac413 100644
--- a/gs-carcolor/src/main/java/org/genericsystem/carcolor/CarColorApp.java
+++ b/gs-carcolor/src/main/java/org/genericsystem/carcolor/CarColorApp.java
@@ -7,7 +7,6 @@
 import org.genericsystem.carcolor.model.Power;
 import org.genericsystem.common.Generic;
 import org.genericsystem.common.Root;
-import org.genericsystem.reactor.ReactorStatics;
 import org.genericsystem.reactor.annotations.DependsOnModel;
 import org.genericsystem.reactor.annotations.RunScript;
 import org.genericsystem.reactor.appserver.ApplicationServer;
@@ -17,6 +16,7 @@
 import org.genericsystem.reactor.gs.GSEditor;
 import org.genericsystem.reactor.gs.GSMonitor;
 import org.genericsystem.reactor.gs.GSTable;
+import org.genericsystem.reactor.gs.SelectionDefaults;
 
 import io.vertx.core.http.ServerWebSocket;
 
@@ -26,7 +26,7 @@
  */
 @RunScript(CarColorScript.class)
 @DependsOnModel({ Car.class, Power.class, Color.class, CarColor.class })
-public class CarColorApp extends GSApp {
+public class CarColorApp extends GSApp implements SelectionDefaults {
 
 	public static void main(String[] mainArgs) {
 		ApplicationServer.sartSimpleGenericApp(mainArgs, CarColorApp.class, "/cars");
@@ -34,7 +34,7 @@ public static void main(String[] mainArgs) {
 
 	public CarColorApp(Root engine, ServerWebSocket webSocket) {
 		super(webSocket);
-		createNewProperty(ReactorStatics.SELECTION);
+		createSelectionProperty();
 		addStyle("background-color", "#3393ff");
 
 		new GSHeader(this, "Generic System Reactor Live Demo", null, "", GSUserGuide::new, "");
diff --git a/gs-carcolor/src/main/java/org/genericsystem/carcolor/GSModal.java b/gs-carcolor/src/main/java/org/genericsystem/carcolor/GSModal.java
index a1fda4893..b5fd17dab 100644
--- a/gs-carcolor/src/main/java/org/genericsystem/carcolor/GSModal.java
+++ b/gs-carcolor/src/main/java/org/genericsystem/carcolor/GSModal.java
@@ -24,7 +24,7 @@ public GSModal(GSTag parent, Consumer<GSTag> contentTagConsumer) {
 	public GSModal(GSTag parent, FlexDirection direction, Consumer<GSTag> contentTagConsumer) {
 		super(parent, direction);
 		addStyleClass("modal");
-		bindStyle(ReactorStatics.DISPLAY, ReactorStatics.DISPLAY, model -> Bindings.createStringBinding(() -> getSelectionProperty(model).getValue() != null ? "flex" : "none", this.getProperty(ReactorStatics.SELECTION, model)));
+		bindStyle(ReactorStatics.DISPLAY, ReactorStatics.DISPLAY, model -> Bindings.createStringBinding(() -> getSelectionProperty(model).getValue() != null ? "flex" : "none", getSelectionProperty(model)));
 
 		new GSSection(this, FlexDirection.COLUMN) {
 			{
diff --git a/gs-reactor/src/main/java/org/genericsystem/reactor/ReactorStatics.java b/gs-reactor/src/main/java/org/genericsystem/reactor/ReactorStatics.java
index 3593a032c..84238592a 100644
--- a/gs-reactor/src/main/java/org/genericsystem/reactor/ReactorStatics.java
+++ b/gs-reactor/src/main/java/org/genericsystem/reactor/ReactorStatics.java
@@ -11,7 +11,6 @@ public class ReactorStatics {
 	public static final String INVALID = "invalid";
 	public static final String INVALID_LIST = "invalidList";
 	public static final String NEW_INSTANCE = "newInstance";
-	public static final String SELECTION = "selection";
 	public static final String SELECTION_INDEX = "selectionIndex";
 	public static final String SELECTION_SHIFT = "selectionShift";
 	public static final String SELECTION_STRING = "selectionString";
diff --git a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSComposite.java b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSComposite.java
index c41df2508..145b01948 100644
--- a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSComposite.java
+++ b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSComposite.java
@@ -122,10 +122,8 @@ public ColorCompositeRadio(GSTag parent, FlexDirection flexDirection) {
 			createSelectionProperty();
 			storeProperty(ReactorStatics.SELECTION_INDEX, model -> model.getSelectionIndex(this));
 			bindBiDirectionalSelection(flexSubElement);
-			storeProperty(
-					ReactorStatics.SELECTION_STRING,
-					model -> Bindings.createStringBinding(() -> StringExtractor.SIMPLE_CLASS_EXTRACTOR.apply(getSelectionProperty(model).getValue() != null ? getSelectionProperty(model).getValue().getGeneric() : null),
-							getProperty(ReactorStatics.SELECTION, model)));
+			storeProperty(ReactorStatics.SELECTION_STRING,
+					model -> Bindings.createStringBinding(() -> StringExtractor.SIMPLE_CLASS_EXTRACTOR.apply(getSelectionProperty(model).getValue() != null ? getSelectionProperty(model).getValue().getGeneric() : null), getSelectionProperty(model)));
 			bindStyle("background-color", ReactorStatics.SELECTION_STRING);
 			addStyle("padding", "4px");
 		}
diff --git a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSelect.java b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSelect.java
index 2bec9bf34..dbb08fa2f 100644
--- a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSelect.java
+++ b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSelect.java
@@ -8,7 +8,6 @@
 
 import org.genericsystem.reactor.ReactorStatics;
 import org.genericsystem.reactor.gstag.GSOption;
-import org.genericsystem.reactor.model.GenericModel;
 import org.genericsystem.reactor.model.ObservableListExtractor;
 import org.genericsystem.reactor.model.StringExtractor;
 
@@ -23,8 +22,8 @@ private GSSelect(GSTag parent) {
 		createSelectionProperty();
 		storeProperty(ReactorStatics.SELECTION_INDEX, model -> model.getSelectionIndex(this));
 		bindBiDirectionalSelection(optionElement);
-		storeProperty(ReactorStatics.SELECTION_STRING, model -> Bindings.createStringBinding(
-				() -> StringExtractor.SIMPLE_CLASS_EXTRACTOR.apply(getSelectionProperty(model).getValue() != null ? ((GenericModel) getProperty(ReactorStatics.SELECTION, model).getValue()).getGeneric() : null), getSelectionProperty(model)));
+		storeProperty(ReactorStatics.SELECTION_STRING,
+				model -> Bindings.createStringBinding(() -> StringExtractor.SIMPLE_CLASS_EXTRACTOR.apply(getSelectionProperty(model).getValue() != null ? getSelectionProperty(model).getValue().getGeneric() : null), getSelectionProperty(model)));
 	}
 
 	@Override
diff --git a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSingleLinkComponentEditor.java b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSingleLinkComponentEditor.java
index 905d7ae0b..cbda02f2d 100644
--- a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSingleLinkComponentEditor.java
+++ b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/GSSingleLinkComponentEditor.java
@@ -42,7 +42,7 @@ public GSSingleLinkComponentEditor(GSTag parent, GSSelectConstructor constructor
 		select.addPostfixBinding(model -> {
 			Property<List<Property<GenericModel>>> selectedComponents = getProperty(ReactorStatics.COMPONENTS, model.getParent());
 			if (selectedComponents != null)
-				selectedComponents.getValue().add(select.getProperty(ReactorStatics.SELECTION, model));
+				selectedComponents.getValue().add(select.getSelectionProperty(model));
 		});
 		new GSLabelDisplayer(this) {
 			{
diff --git a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/SelectionDefaults.java b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/SelectionDefaults.java
index 61171189e..dbab7564f 100644
--- a/gs-reactor/src/main/java/org/genericsystem/reactor/gs/SelectionDefaults.java
+++ b/gs-reactor/src/main/java/org/genericsystem/reactor/gs/SelectionDefaults.java
@@ -20,6 +20,8 @@
  */
 public interface SelectionDefaults {
 
+	public static final String SELECTION = "selection";
+
 	// void addPrefixBinding(Consumer<GenericModel> consumer);
 
 	void addPostfixBinding(Consumer<GenericModel> consumer);
@@ -29,11 +31,11 @@ public interface SelectionDefaults {
 	<T> Property<T> getProperty(String property, Model model);
 
 	default void createSelectionProperty() {
-		createNewProperty(ReactorStatics.SELECTION);
+		createNewProperty(SELECTION);
 	}
 
 	default Property<GenericModel> getSelectionProperty(GenericModel model) {
-		return getProperty(ReactorStatics.SELECTION, model);
+		return getProperty(SELECTION, model);
 	}
 
 	default void bindBiDirectionalSelection(Tag<GenericModel> subElement) {