Open TabGroup from a home Window

app.js

var tabGroup;

var win = Ti.UI.createWindow({ 
  backgroundColor: '#fff',
  layout: 'vertical',
  exitOnClose: true,
  navBarHidden: true
});

var createButton = Ti.UI.createButton({
  title: "open",
  top: 20,
  height: 50,
  width: 250,
});
createButton.addEventListener('click', function(e){
	
  tabGroup = Ti.UI.createTabGroup();
  var win1 = Ti.UI.createWindow({
    backgroundColor: 'blue'
  });
  var deleteButton = Ti.UI.createButton({
    title: "close",
    top: 20,
    height: 50,
    width: 250,
  });
  deleteButton.addEventListener('click', function(e){
    tabGroup.close();
  });
  win1.add(deleteButton);
  
  var win2 = Ti.UI.createWindow({backgroundColor: 'blue'});

  // capture the back button being pressed for both tab windows
  win1.addEventListener('android:back', function(e){
  	Ti.API.info('win1 BACK');
  	tabGroup.close();
  });
  win2.addEventListener('android:back', function(e){
  	Ti.API.info('win2 BACK');
  	tabGroup.close();
  });
  
  var tab1 = Ti.UI.createTab({ title: 'Tab 1', window: win1 });
  var tab2 = Ti.UI.createTab({ title: 'Tab 2', window: win2 });
  
  tabGroup.addTab(tab1);
  tabGroup.addTab(tab2);
  
  tabGroup.open();

});

win.add(createButton);
win.open();