#ifndef TOOLBAR_H_
#define TOOLBAR_H_
+#include <sigc++/trackable.h>
#include <msp/gltk/dropdown.h>
#include <msp/gltk/panel.h>
class Designer;
-class Toolbar: public Msp::GLtk::Panel
+class Toolbar: public Msp::GLtk::Panel, public sigc::trackable
{
private:
Designer &designer;