[gtkmm] Add some TODOs

[Murray Cumming <murrayc src gnome org>]

commit 16279706ab4a1ffb4cd75c32ebbd7ab99b9c8c1a
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Feb 4 10:14:50 2013 +0100

    Add some TODOs

 gtk/src/scalebutton.hg |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtk/src/scalebutton.hg b/gtk/src/scalebutton.hg
index 7d9822c..d9c5321 100644
--- a/gtk/src/scalebutton.hg
+++ b/gtk/src/scalebutton.hg
@@ -61,10 +61,15 @@ public:
 
   _IGNORE(gtk_scale_button_get_orientation, gtk_scale_button_set_orientation) //deprecated
 
+  //TODO: Change the Widget* return type to Gtk::Button: https://bugzilla.gnome.org/show_bug.cgi?id=539944
   _WRAP_METHOD(Widget* get_plus_button(), gtk_scale_button_get_plus_button)
   _WRAP_METHOD(const Widget* get_plus_button() const, gtk_scale_button_get_plus_button, constversion)
+
+  //TODO: Change the Widget* return type to Gtk::Button: https://bugzilla.gnome.org/show_bug.cgi?id=539944
   _WRAP_METHOD(Widget* get_minus_button(), gtk_scale_button_get_minus_button)
   _WRAP_METHOD(const Widget* get_minus_button() const, gtk_scale_button_get_minus_button, constversion)
+
+  //TODO: Use a more specific return type?
   _WRAP_METHOD(Gtk::Widget* get_popup(), gtk_scale_button_get_popup)
   _WRAP_METHOD(const Gtk::Widget* get_popup() const, gtk_scale_button_get_popup)