Wont logout of face custon button

//Top left login facebook button blue   
var fbLogin = Ti.UI.createButton ({
    top:5,
    left:5,
    width:'48%',
    height:'32%',
    backgroundColor:'#3b5998',
    font: {fontWeight:'bold',fontFamily:'Helvetica', fontSize:15},
    title: 'LOGIN FACEBOOK',
    toggle : false
});
 
//facebook login button top left evenlistener 
fbLogin.addEventListener('click', function(e) {
 
 
 
 
    if (fbLogin.toggle == false) {
 
        fba();
 
        fb.addEventListener('login', function(e) {
            if (e.success) {
                alert('Logged in');
                fbLogin.toggle = true;
                fbLogin.title = 'LOGGED IN';
            }
        });
 
    } else {
        fb.addEventListener('logout', function(e) {
            alert('Logged out');
            fbLogin.toggle = false;
            fbLogin.title = 'LOGGED OUT';
        });
 
    }
 
});