[TIMOB-883] Showing an alert dialog from a parent context / activity gets sandwiched when another Activity is currently open

This problem is pretty simple to reproduce.. code:

var tabGroup = Ti.UI.createTabGroup();
var win = Ti.UI.createWindow();
var label = Ti.UI.createLabel({
  bottom: 0, top: 0, right: 0, left: 0,
  text: "Click Me"
});
label.addEventListener("click", function(e) {
  Ti.UI.createAlertDialog({message: "Clicked"}).show();
});
win.add(label);

var tab = Ti.UI.createTab({ title: 'Tab', window: win });
tabGroup.addTab(tab);
tabGroup.open();

The alert dialog is created, but never shown