--- a/mamba/widgets/base.py	Wed Sep 14 20:30:34 2011 +0200
+++ b/mamba/widgets/base.py	Wed Sep 14 20:31:16 2011 +0200
@@ -2,7 +2,10 @@
 
 import pygame
 from pygame.constants import K_UP, K_DOWN, K_RETURN
-from pygame.locals import MOUSEMOTION, MOUSEBUTTONUP, MOUSEBUTTONDOWN, KEYDOWN
+from pygame.locals import (KEYDOWN, MOUSEMOTION, MOUSEBUTTONUP,
+                           MOUSEBUTTONDOWN, USEREVENT)
+
+from mamba.engine import UserEvent
 
 
 class Widget(object):
@@ -20,7 +23,16 @@
         self.callbacks[eventtype].append((callback, args))
 
     def event(self, ev):
-        for callback, args in self.callbacks[ev.type]:
+        "Don't override this without damn good reason"
+        type_ = ev.type
+        if type_ == USEREVENT:
+            for k in self.callbacks.iterkeys():
+                if (isinstance(k, type) and issubclass(k, UserEvent)
+                        and k.matches(ev)):
+                    type_ = k
+                    break
+
+        for callback, args in self.callbacks[type_]:
             if callback(ev, self, *args):
                 return True
         return False