matplotlib
diff --git a/‎examples/user_interfaces/navigation.py
+3-7 b/‎examples/user_interfaces/navigation.py
+3-7
@@ -12,7 +12,7 @@ class ListTools(ToolBase):
     keymap = 'm'
     description = 'List Tools'
 
-    def trigger(self, event):
+    def trigger(self, *args, **kwargs):
         tools = self.navigation.get_tools()
 
         print ('_' * 80)
@@ -36,7 +36,7 @@ class CopyToolGTK3(ToolBase):
     # It is not added to the toolbar as a button
     intoolbar = False
 
-    def trigger(self, event):
+    def trigger(self, *args, **kwargs):
         from gi.repository import Gtk, Gdk
         clipboard = Gtk.Clipboard.get(Gdk.SELECTION_CLIPBOARD)
         window = self.figure.canvas.get_window()
@@ -45,9 +45,6 @@ def trigger(self, event):
         clipboard.set_image(pb)
 
 
-
-
-
 fig = plt.figure()
 plt.plot([1, 2, 3])
 
@@ -56,8 +53,7 @@ def trigger(self, event):
 if matplotlib.rcParams['backend'] == 'GTK3Cairo':
     fig.canvas.manager.navigation.add_tool('copy', CopyToolGTK3)
 
-# # Just for fun, lets remove the forward button
+# Uncomment to remove the forward button
 # fig.canvas.manager.navigation.remove_tool('forward')
 
-
 plt.show()