CustomEventComponent.cs

using System.Web.Security;
using Umbraco.Core;
using Umbraco.Core.Composing;
using Umbraco.Core.Events;
using Umbraco.Core.Scoping;
using Umbraco.Core.Services;
using Umbraco.Core.Services.Implement;
using System.Linq;
using System;
using Umbraco.Core.Security;
using Umbraco.Web.Editors;
using Umbraco.Web;
using Umbraco.Web.Dashboards;
using Umbraco.Web.PublishedModels;

namespace MySite.Custom
{
   
    [RuntimeLevel(MinLevel = RuntimeLevel.Run)]
    public class CustomEventComposer : ComponentComposer<CustomEventComponent>
    { }

    public class CustomEventComponent : IComponent
    {
        public void Initialize()
        {
            
            EditorModelEventManager.SendingContentModel += EditorModelEventManager_SendingContentModel;
           
     
        }
        
        private void EditorModelEventManager_SendingContentModel(System.Web.Http.Filters.HttpActionExecutedContext sender, EditorModelEventArgs<Umbraco.Web.Models.ContentEditing.ContentItemDisplay> e)
        {
           var identity = (UmbracoBackOfficeIdentity)System.Web.HttpContext.Current.User.Identity;
           var currentUSer = Current.Services.UserService.GetByProviderKey(identity.Id);

            if (!currentUSer.Groups.Any(x => x.Alias == "admin"))
            {
                foreach (var variant in e.Model.Variants)
                    variant.Tabs = variant.Tabs.Where(x => x.Label != "Admin");
            }
        }

        public void Terminate()
        {
            
        }
    }
}