+ side_buttons->Add (target_buttons, 0, 0);
+
+ auto check_buttons = new wxBoxSizer (wxVERTICAL);
+
+ _check_all = new Button (this, _("Check all"));
+ check_buttons->Add (_check_all, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
+ _uncheck_all = new Button (this, _("Uncheck all"));
+ check_buttons->Add (_uncheck_all, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
+
+ side_buttons->Add (check_buttons, 1, wxEXPAND | wxTOP, DCPOMATIC_BUTTON_STACK_GAP * 8);
+
+ targets->Add (side_buttons, 0, 0);