Mainloop with zenity

foo.sh

#!/bin/bash
function washcar()
{
    echo "Car washed."
}

function mow()
{
    echo "Lawn mown."
}

while true; do
    CHOICE=$(zenity --list --radiolist \
	--title="Lazy man's menu" \
	--column="Selection" \
	--column="Name" \
	--column="Description" \
	--width=550 --height=625 \
	'FALSE' "Do Something" "Wash my car" \
	'FALSE' "Do Something Else" "Mow the lawn" \
	'FALSE' "Exit" "Exit")
    case $CHOICE in
	"Do Something") washcar ;;
	"Do Something Else") mow ;;
	"Exit") exit 0 ;;
    esac
done