diff --git a/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/CommonActivityExplorerPage.java b/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/CommonActivityExplorerPage.java
index 6853d43..6a42019 100644
--- a/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/CommonActivityExplorerPage.java
+++ b/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/CommonActivityExplorerPage.java
@@ -189,7 +189,7 @@
     boolean result = ActivityExplorerActivator.getDefault().getPreferenceStore().getBoolean(getId());
     result &= !WorkbenchActivityHelper.filterItem(this);
     if (predicate != null) {
-      result &= predicate.isOk();
+      result &= predicate.isPageOk(this);
     }
     return result;
   }
diff --git a/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/OverviewActivityExplorerPage.java b/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/OverviewActivityExplorerPage.java
index e18b9ca..d00d41f 100644
--- a/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/OverviewActivityExplorerPage.java
+++ b/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/pages/OverviewActivityExplorerPage.java
@@ -262,7 +262,7 @@
 		// By default all Overview page are visible (cf. bug 485652)
 		boolean result = true;
 		if (predicate != null) {
-			result &= predicate.isOk();
+			result &= predicate.isPageOk(this);
 		}
 		return result;
 	}
diff --git a/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/predicates/IPredicate.java b/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/predicates/IPredicate.java
index 817b85e..d0eb2e8 100644
--- a/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/predicates/IPredicate.java
+++ b/plugins/org.eclipse.amalgam.explorer.activity.ui/src/org/eclipse/amalgam/explorer/activity/ui/api/editor/predicates/IPredicate.java
@@ -16,14 +16,14 @@
 public interface IPredicate {
 
   public default boolean isOk() {
-    return true;
+    return false;
   }
-  
-	public default boolean isActivityOk(ExplorerActivity activity) {
-	  return true;
-	}
 
-	public default boolean isPageOk(CommonActivityExplorerPage page) {
-    return true;
+  public default boolean isActivityOk(ExplorerActivity activity) {
+    return isOk();
+  }
+
+  public default boolean isPageOk(CommonActivityExplorerPage page) {
+    return isOk();
   }
 }