_content->Bind (wxEVT_DROP_FILES, boost::bind (&ContentPanel::files_dropped, this, _1));
_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));
_content->Bind (wxEVT_DROP_FILES, boost::bind (&ContentPanel::files_dropped, this, _1));
_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));