_show->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::show_clicked, this));
_gain_calculate_button->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::gain_calculate_button_clicked, this));
_fade_in->Changed.connect (boost::bind(&AudioPanel::fade_in_changed, this));
_fade_out->Changed.connect (boost::bind(&AudioPanel::fade_out_changed, this));
_show->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::show_clicked, this));
_gain_calculate_button->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::gain_calculate_button_clicked, this));
_fade_in->Changed.connect (boost::bind(&AudioPanel::fade_in_changed, this));
_fade_out->Changed.connect (boost::bind(&AudioPanel::fade_out_changed, this));