public static frmDnevnikObuke Instance()
        {
            if (dnevnik == null)
            {
                dnevnik = new frmDnevnikObuke();
            }

            return(dnevnik);
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);

            dnevnik = null;
        }