diff --git a/panda/src/display/graphicsStateGuardian.h b/panda/src/display/graphicsStateGuardian.h
index d6e8dc8054..7e008d5450 100644
--- a/panda/src/display/graphicsStateGuardian.h
+++ b/panda/src/display/graphicsStateGuardian.h
@@ -155,7 +155,7 @@ protected:
 
   CoordinateSystem _coordinate_system;
 
-private:
+protected:
   typedef set<TextureContext *> Textures;
   Textures _prepared_textures;
 
diff --git a/panda/src/display/graphicsWindow.h b/panda/src/display/graphicsWindow.h
index b6b225fe4e..99451e6de7 100644
--- a/panda/src/display/graphicsWindow.h
+++ b/panda/src/display/graphicsWindow.h
@@ -133,6 +133,8 @@ PUBLISHED:
   INLINE bool has_pointer(int device) const;
   INLINE bool has_keyboard(int device) const;
 
+  virtual void process_events(void) { return; };   // process window events
+
 public:
   INLINE const MouseData &get_mouse_data(int device) const;
   INLINE bool has_button_event(int device) const;