correct external monitor resolution

-- OS X 10.9.2

--this script (c) Phil Stokes / Applehelpwriter 2014
--applehelpwriter.com

(*
This script automates clicking the 'Detect Displays' button in System Preferences
You will need to allow access to Assistive Devices in Sys Prefs > Security settings for it to work
Very useful combined with a hotkey to quickly get your external monitor resolution correct
*)

try
    --if sys prefs is already open, lets quit it first*
    tell application "System Preferences" to quit
end try
delay 1
tell application "System Preferences"
    activate
    reveal pane "com.apple.preference.displays"
end tell


tell application "System Events"
    tell process "System Preferences"
        set frontmost to true
        try
            key down option
            delay 0.2
            click button "Detect Displays" of window 1
            delay 0.2
            key up option
        on error
            key up option
        end try
    end tell
end tell

tell application "System Preferences" to quit