ToolbarItem no show in new update

Hello,
my old code is

public test ()
{

        ToolbarItem tab = new ToolbarItem {
            Name = "Name"
        };

        this.ToolbarItems.Add (tab);
    }

I work update Xamarin.Forms 1.2.3.6257 and my code is not work. Debug is ok , but my Tollbaritem is not show on

Before update

After update