private void UserStartSpeakEventHandler(MeetingResult <UserSpeakModel> obj)
        {
            var attendeeItem = AttendeeItems.FirstOrDefault(attendee => attendee.Id == obj.Result.Account.AccountId.ToString());

            if (attendeeItem != null)
            {
                attendeeItem.Content = CancelSpeaking;
            }
        }
        private void OtherStartSpeakEventHandler(Participant participant)
        {
            var attendeeItem = AttendeeItems.FirstOrDefault(attendee => attendee.Id == participant.PhoneId);

            if (attendeeItem != null)
            {
                attendeeItem.Content = CancelSpeaking;
            }
        }
        private void _sdkService_ViewCreateEvent(ParticipantView speakerView)
        {
            var targetAttendee = AttendeeItems.FirstOrDefault(
                attendee => attendee.Id == speakerView.Participant.PhoneId && attendee.Hwnd == speakerView.Hwnd);

            if (targetAttendee != null)
            {
                targetAttendee.Content = CancelSpeaking;
            }
        }