A DESCRIPTION OF THE REQUEST :
Tabs aren't Labeleds and so they don't have mnemonics

However giving them a Mnemonic, would be a worth-while addition.

If Tab can't extend Labeled, can it have similar mnemonic methods anyway?



JUSTIFICATION :
Being able to switch to *specific* tabs using mnemonics would make for a more-efficient UX.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
One should be able to switch to a specific tab using a Mnemonic.
ACTUAL -
One can only traverse tabs in linear order, using CTRL + TAB

---------- BEGIN SOURCE ----------
        Tab firstTab = new Tab("_First");
        Tab secondTab = new Tab("_Second");
        Tab thirdTab = new Tab("_Third");

        TabPane tabPane = new TabPane(firstTab, secondTab, thirdTab);
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I tried to .lookup Tab's label 

    firstTab.lookup(".label");

and add a Mnemonic directly to the label,

    label.setMnemonicParsing(true);
    label.setText("_First");

but this does not work because Tab's `.lookup()` method is package private and only looks up things in the Tab's content.