BindableApplicationBar.BindableApplicationBar.Attach C# (CSharp) Method

        public void Attach(PhoneApplicationPage parentPage)
        {
            this.page = parentPage;
            this.applicationBar =
                (ApplicationBar)(//parentPage.ApplicationBar ?? 
                (parentPage.ApplicationBar = new ApplicationBar()));
            this.applicationBar.StateChanged +=
                this.ApplicationBarStateChanged;

            if (this.GetBindingExpression(DataContextProperty) == null &&
                this.DataContext == null)
            {
                this.SetBinding(
                    DataContextProperty,
                    new Binding("DataContext") { Source = this.page });
            }

            this.SynchronizeProperties();
            this.AttachButtons(this.Buttons);
            this.AttachButtons(this.buttonsSourceButtons);
            this.AttachMenuItems(this.MenuItems);
            this.AttachMenuItems(this.menuItemsSourceMenuItems);

            if (this.Buttons != null && this.Buttons.Count > 0)
            {
                this.page.Loaded += this.OnPageLoaded;                
            }
        }