--- /dev/null
+--- bkchem-0.9.0/bkchem/modes.py 2004-11-24 15:08:14.000000000 +0100
++++ bkchem-0.9.0-new/bkchem/modes.py 2004-12-17 00:35:49.000000000 +0100
+@@ -1654,8 +1654,12 @@
+
+ self._mark_reaction()
+
++ def mouse_down2( self, event, modifiers = []):
++ return
+
+-
++ def mouse_down3( self, event, modifiers = []):
++ return
++
+ def _mark_reaction( self):
+ for i in self._items:
+ self.app.paper.delete( i)