public override bool OnOptionsItemSelected(IMenuItem item)
        {
            try
            {
                switch (item.ItemId)
                {
                case Resource.Id.menu_ebook_ebooks:
                    var ebooksfragment = new EbooksFragment();
                    var ft             = ChildFragmentManager.BeginTransaction();
                    var fragment       = this.ChildFragmentManager.FindFragmentById(Resource.Id.dry_ebookframelayout);
                    if (fragment != null)
                    {
                        ft.Remove(fragment);
                    }
                    ft.Replace(Resource.Id.dry_ebookframelayout, ebooksfragment);
                    ft.Commit();
                    return(true);

                case Resource.Id.menu_ebook_ebookcategories:
                    var ebookcategsfragment = new EbookCategoriesFragment();
                    var ft1       = ChildFragmentManager.BeginTransaction();
                    var fragment1 = this.ChildFragmentManager.FindFragmentById(Resource.Id.dry_ebookframelayout);
                    if (fragment1 != null)
                    {
                        ft1.Remove(fragment1);
                    }
                    ft1.Replace(Resource.Id.dry_ebookframelayout, ebookcategsfragment);
                    ft1.Commit();
                    return(true);

                case Resource.Id.menu_ebook_ebooksubjects:
                    var ebooksubjectsfragment = new SubjectsFragment();
                    var ft2       = ChildFragmentManager.BeginTransaction();
                    var fragment2 = this.ChildFragmentManager.FindFragmentById(Resource.Id.dry_ebookframelayout);
                    if (fragment2 != null)
                    {
                        ft2.Remove(fragment2);
                    }
                    ft2.Replace(Resource.Id.dry_ebookframelayout, ebooksubjectsfragment);
                    ft2.Commit();
                    return(true);
                }
            }
            catch (Exception ex)
            {
            }
            return(base.OnOptionsItemSelected(item));
        }
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            // Use this to return your custom view for this Fragment
            // return inflater.Inflate(Resource.Layout.YourFragment, container, false);

            base.OnCreateView(inflater, container, savedInstanceState);
            var view         = inflater.Inflate(Resource.Layout.ebookshomelayout, container, false);
            var ft           = ChildFragmentManager.BeginTransaction();
            var viewfragment = new EbooksFragment();

            ft.Replace(Resource.Id.dry_ebookframelayout, viewfragment);
            ft.Commit();

            //SetHasOptionsMenu(true);
            this.HasOptionsMenu = true;

            return(view);
        }