I'm trying to set the Access attribute for a block, so only a specific group is able to create that block (rather than the default "Everyone"). I'm following the info here:

http://world.episerver.com/documentation/Items/Developers-Guide/EPiServer-CMS/8/Content/Attributes/

http://world.episerver.com/documentation/Class-library/?documentId=cms/9/CD41BF37

The block is still being created with the default "Everyone" access. Am I missing something?

Sample code:

namespace cms.Models.Blocks
{
    [ContentType(DisplayName = "PageTitleBlock", GUID = "623351a8-55c0-4f9f-af08-18a1ffe9ba0f", Description = "")]

    [Access(Roles = "BlockCreators")]

    public class PageTitleBlock : BlockData
    {
        [UIHint(UIHint.Image)]
        [Display(
            Name = "Image",
            Description = "Background image for banner",
            GroupName = SystemTabNames.Content,
            Order = 1)]
        public virtual ContentReference Image { get; set; }

        [CultureSpecific]
        [Display(
            Name = "Title",
            Description = "Page Title",
            GroupName = SystemTabNames.Content,
            Order = 2)]
        public virtual String Title { get; set; }

        [CultureSpecific]
        [Display(
            Name = "Subtitle",
            Description = "Page subtitle",
            GroupName = SystemTabNames.Content,
            Order = 3)]
        public virtual String Subtitle { get; set; }
    }
}