improved component child handling

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/leaderboard/LeaderboardEntryPoint.java

@@ -179,7 +179,7 @@ public class LeaderboardEntryPoint extends AbstractSailingEntryPoint {
             final LeaderboardPerspectiveLifecycle lifecycle = new LeaderboardPerspectiveLifecycle(getStringMessages());
             final LeaderboardComponentContext componentContext = new LeaderboardComponentContext(lifecycle,
                     new UserSettingsStorageManager<>(getUserService(),
-                            UserSettingsStorageManager.buildContextDefinitionId("LeaderboardEntryPoint", "Meta"),
+                            UserSettingsStorageManager.buildContextDefinitionId("LeaderboardEntryPoint", "Single"),
                             leaderboardContextSettings.getRegattaName()));
             componentContext.initInitialSettings(new OnSettingsLoadedCallback<PerspectiveCompositeSettings<LeaderboardPerspectiveOwnSettings>>() {
                 @Override

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/leaderboard/LeaderboardViewer.java

@@ -76,6 +76,7 @@ public class LeaderboardViewer extends AbstractLeaderboardViewer<LeaderboardPers
 
         mainPanel.add(getLeaderboardPanel());
         mainPanel.add(multiCompetitorChart);
+        addChildComponent(multiCompetitorChart);
 
         addComponentToNavigationMenu(getLeaderboardPanel(), false, null, /* hasSettingsWhenComponentIsInvisible*/ true);
         addComponentToNavigationMenu(multiCompetitorChart, true, null,  /* hasSettingsWhenComponentIsInvisible*/ true);

java/com.sap.sse.gwt/src/com/sap/sse/gwt/client/shared/perspective/AbstractPerspectiveComposite.java

@@ -33,7 +33,10 @@ public abstract class AbstractPerspectiveComposite<PL extends PerspectiveLifecyc
      * @param childComponent The component to be added as a child to this perspective
      */
     protected void addChildComponent(Component<? extends Settings> childComponent) {
-        childComponents.put(childComponent.getId(), childComponent);
+        Component<? extends Settings> old = childComponents.put(childComponent.getId(), childComponent);
+        if (old != null) {
+            throw new IllegalStateException("Child with same id is allready added");
+        }
     }
     
     @Override