_x_offset->Bind (wxEVT_COMMAND_SPINCTRL_UPDATED, boost::bind (&SubtitlePanel::x_offset_changed, this));
_y_offset->Bind (wxEVT_COMMAND_SPINCTRL_UPDATED, boost::bind (&SubtitlePanel::y_offset_changed, this));
_x_scale->Bind (wxEVT_COMMAND_SPINCTRL_UPDATED, boost::bind (&SubtitlePanel::x_scale_changed, this));
_x_offset->Bind (wxEVT_COMMAND_SPINCTRL_UPDATED, boost::bind (&SubtitlePanel::x_offset_changed, this));
_y_offset->Bind (wxEVT_COMMAND_SPINCTRL_UPDATED, boost::bind (&SubtitlePanel::y_offset_changed, this));
_x_scale->Bind (wxEVT_COMMAND_SPINCTRL_UPDATED, boost::bind (&SubtitlePanel::x_scale_changed, this));