diff -r 74065e83844d -r c5cdf6690cdf graph_displayer_canvas-zoom.cc
--- a/graph_displayer_canvas-zoom.cc	Thu Sep 28 09:26:48 2006 +0000
+++ b/graph_displayer_canvas-zoom.cc	Thu Sep 28 14:32:40 2006 +0000
@@ -5,12 +5,20 @@
 {
   set_pixels_per_unit(
       (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
+  if(zoomtrack)
+    {
+      propertyChange(false, N_RADIUS);
+    }
 }
 
 void GraphDisplayerCanvas::zoomOut()
 {
   set_pixels_per_unit(
       (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
+  if(zoomtrack)
+    {
+      propertyChange(false, N_RADIUS);
+    }
 }
 
 void GraphDisplayerCanvas::zoomFit()
@@ -31,12 +39,22 @@
   double ppu1 = (double) aw / fabs(x2 - x1);
   double ppu2 = (double) ah / fabs(y2 - y1);
   set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
+
+  if(zoomtrack)
+    {
+      propertyChange(false, N_RADIUS);
+    }
 }
 
 void GraphDisplayerCanvas::zoom100()
 {
   updateScrollRegion();
   set_pixels_per_unit(1.0);
+
+  if(zoomtrack)
+    {
+      propertyChange(false, N_RADIUS);
+    }
 }
 
 void GraphDisplayerCanvas::updateScrollRegion()