protected void btnPlayer_Click(object sender, EventArgs e)
        {
            using (AttendancesController ac = new AttendancesController())
            {
                ClickablePanel panel = (ClickablePanel)sender;

                ac.AddNew(new Attendance()
                {
                    CreateDate = DateTime.Now.ToUniversalTime(),
                    CreateUserID = CurrentUser.UserID,
                    IsActive = true,
                    PlayerID = panel.PlayerID,
                    TeamScheduleID = TeamScheduleID.Value
                });

                panel.CssClass += " success";
                panel.IsDisabled = true;
            }
        }