svoid addOrReplaceTab(JTabbedPane tabs, S tabName, Swingable c) {
  addOrReplaceTab(tabs, tabName, wrap(c));
}

svoid addOrReplaceTab(JTabbedPane tabs, S tabName, Component c) swing {
  if (tabs == null) ret;
  int idx = indexOfTabName(tabs, tabName);
  if (idx >= 0)
    setTab(tabs, idx, c);
  else
    addTabs(tabs, tabName, c);
}