Detect display

tell application "System Settings" to activate

delay 0.5

tell application "System Events"
    tell process "System Settings"
        click menu item "Displays" of menu "View" of menu bar 1
        try --don't even consider not using a try block!
            key down option
            delay 1.0
            click button "Detect Displays" of window 1
            delay 0.2
            key up option
        on error --logging out is the only other way to clear these
            key up option
        end try
    end tell
end tell