svoid addTabWithToolTip(JTabbedPane tabs, S title, S toolTip, Component c) {
  if (tabs == null) ret;
  swing {
    addTab(tabs, title, c);
    if (nempty(toolTip))
      tabs.setToolTipTextAt(tabCount(tabs)-1, toolTip);
  }
}

svoid addTabWithToolTip(JTabbedPane tabs, S title, S toolTip, Swingable c) {
  addTabWithToolTip(tabs, title, toolTip, wrap(c));
}