panel->SetSizer (sizer);
auto overall_sizer = new wxBoxSizer (wxVERTICAL);
overall_sizer->Add (panel, 1, wxTOP | wxLEFT | wxRIGHT, DCPOMATIC_SIZER_GAP);
panel->SetSizer (sizer);
auto overall_sizer = new wxBoxSizer (wxVERTICAL);
overall_sizer->Add (panel, 1, wxTOP | wxLEFT | wxRIGHT, DCPOMATIC_SIZER_GAP);