// x = names and components interleaving.
// or just components.
// or just names.
// also, first element can be index of tab to open at start
// also, SUPER short demo syntax: jtabs(3)
// also, you can pass a Collection containing the elements
static JTabbedPane jtabs(O... x) {
  ret fillJTabs(swingNu(JTabbedPane.class), x);
}