I create One Content area,see the below code

namespace MyTemplates.Models.Pages
{
       [ContentType(DisplayName = "Home", GUID = "ead0e7bb-ddc9-40bc-b01a-0ddbabf68fd0", Description = "")]
       public class Home : PageData
       {

         [CultureSpecific]
         [Display(
         Name = "Main body",
         Description = "",
         GroupName = SystemTabNames.Content,
         Order = 1)]
         public virtual ContentArea MainBody { get; set; }
      }
}

but in content area create new block  link button is not displayed, even i cheked views-->Web.config file 

i dont't know where i did mistake,can anyone help me out of this.

Thanks

Ramkee.G