iOS7: Support navTintColor for Titanium.UI.iPad.Popover

var win = Ti.UI.createWindow();

var button = Ti.UI.createButton({title: 'Open Popover!'});

button.addEventListener('click', function(e){

    popover.show({ view: button });

});

win.add(button);

var view = Ti.UI.createView({backgroundColor: 'green'});

view.add(Ti.UI.createLabel({text: "It's not easy being green."}));

var rightButton = Ti.UI.createButton({title: 'Robin'});

rightButton.addEventListener('click', function(e){

    alert("But green's the color of spring.");

});

var popover = Ti.UI.iPad.createPopover({

    width: 250,

    height: 100,

    title: 'Kermit',

    tintColor: 'white',

    rightNavButton: rightButton

});

popover.add(view);

win.open();