fix

src/ui/view/GUI.java

@@ -802,9 +802,6 @@ public class GUI<E> implements CategoryListener {
 					} else {
 						controller.addSelectedObject(temp);
 					}
-				} else if (temp != null) {
-					model.getSelectedCpsObjects().clear();
-					controller.addSelectedObject(temp);
 				}
 				// } else if (e.isShiftDown() && model.getSelectedEdge() !=
 				// null) {