make protected
diff --git a/plugins/org.eclipse.graphiti.ui/src/org/eclipse/graphiti/ui/internal/editor/DiagramEditor.java b/plugins/org.eclipse.graphiti.ui/src/org/eclipse/graphiti/ui/internal/editor/DiagramEditor.java
index 4d001e6..5f76a48 100644
--- a/plugins/org.eclipse.graphiti.ui/src/org/eclipse/graphiti/ui/internal/editor/DiagramEditor.java
+++ b/plugins/org.eclipse.graphiti.ui/src/org/eclipse/graphiti/ui/internal/editor/DiagramEditor.java
@@ -1513,7 +1513,7 @@
 		}
 	}
 
-	private void unregisterBOListener() {
+	protected void unregisterBOListener() {
 		if (domainModelListener != null) {
 			TransactionalEditingDomain eDomain = getTransactionalEditingDomain();
 			eDomain.removeResourceSetListener(domainModelListener);