How to get the return value (Panel) from DirectMethod in Javascript function and add it to a TabPanel?

[Saman]

Ext.net v2.2
.Net Framework v4.5
My Direct Method

 [DirectMethod]
        public static Panel AddTab(int postId)
        {
            var pnlEditPost = new Panel
            {
                ID = postId.ToString(),
                Icon = Icon.BookEdit,
                Title = "Edit",
                Layout = "Fit",
                Closable = true,
                AutoDoLayout = true
            };
            return pnlEditPost;
        }

I dont know how to get the return value (Panel) in JavaScript and add it to my TabPanel