diff --git a/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java b/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
index ed4bc60..41031d0 100644
--- a/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
+++ b/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
@@ -122,4 +122,8 @@
 		}).collect(Collectors.toList());
 		return sortedTpList;
 	}
+	
+	public void shrinkAll() {
+		// TODO Implement shrinkAll().
+	}
 }