--- octave-hg/src/graphics.h.in	2011-03-07 17:28:23.907752000 +0100
+++ octave-build/src/graphics.h.in	2011-03-09 12:04:07.774372002 +0100
@@ -318,7 +318,7 @@ private:
 
 class property;
 
-enum listener_mode { POSTSET };
+enum listener_mode { POSTSET, PERSISTENT };
 
 class base_property
 {
@@ -420,10 +420,33 @@ public:
                 l(j) = l (j + 1);
 
               l.resize (l.length () - 1);
+
+              if (mode != PERSISTENT)
+                delete_listener (v, PERSISTENT);
             }
         }
       else
-        l.resize (0);
+        {
+          if (mode == PERSISTENT)
+            l.resize (0);
+          else
+            {
+              octave_value_list lnew (0);
+              octave_value_list& lp = listeners[PERSISTENT];
+              for (int i = l.length () - 1; i >= 0 ; i--)
+                {
+                  for (int j = 0; j < l.length (); j++)
+                    {
+                      if (l(i).internal_rep () == lp(j).internal_rep ())
+                        {
+                          lnew.resize (lnew.length () + 1, l(i));
+                          break;
+                        }
+                    }
+                  l = lnew;
+                }
+		    }
+        }
 
     }