How to run a backgroundjob with screen by script

RunAgent.sh

#!/bin/bash
programname=MyAppName
start()
{
  screen -dmS $programname /path/to/executeable.sh start
}

stop()
{
  screen -X -S $programname quit
}

status()
{
  screen -list $programname
}

show()
{
  echo -e "\e[7m$programname>\e[27m Detach with STRG + A, STRG + D"
  echo "[waiting 2 seconds...]"
  sleep 2
  screen -r $programname
}

case $1 in
  start|stop|status|show) "$1" ;;
  
  restart)
  stop
  start
  ;;
  
  *)
echo "Usage: $0 start|stop|restart|status|show"
esac