wxBoxSizer* b = new wxBoxSizer (wxVERTICAL);
_content_add_file = new wxButton (_content_panel, wxID_ANY, _("Add file(s)..."));
wxBoxSizer* b = new wxBoxSizer (wxVERTICAL);
_content_add_file = new wxButton (_content_panel, wxID_ANY, _("Add file(s)..."));