_add_file->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::add_file_clicked, this));
_add_folder->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::add_folder_clicked, this));
_remove->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::remove_clicked, this));
_earlier->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::earlier_clicked, this));
_later->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::later_clicked, this));
_timeline->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::timeline_clicked, this));
_add_file->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::add_file_clicked, this));
_add_folder->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::add_folder_clicked, this));
_remove->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::remove_clicked, this));
_earlier->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::earlier_clicked, this));
_later->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::later_clicked, this));
_timeline->Bind (wxEVT_COMMAND_BUTTON_CLICKED, boost::bind (&ContentPanel::timeline_clicked, this));