diff --git a/system/plots.py b/system/plots.py
index b6c2f21..b4f03ec 100644
--- a/system/plots.py
+++ b/system/plots.py
@@ -76,6 +76,8 @@ class ViewFrame (gtk.Frame):
         vbox.pack_start(ebox, expand=False)
         vbox.pack_start(gtk.HSeparator(), expand=False)
 
+        self._ebox_button_event = ebox.connect("button-press-event", 
+                                               self.on_button_press_event)
         ## Keep the references for later use.
         self._vbox = vbox
         self._ebox = ebox