macOS Applescript unlock System Preferences.

[pranavss11]

I am trying to unlock the System Preferences using applescript.

I have managed to get my script to click the "Click the lock to make changes" part, and I was trying to get the applescript to enter the user name, but I keep getting the error

error "System Events got an error: Can’t get window 1 of process \"SecurityAgent\". Invalid index." number -1719 from window 1 of process "SecurityAgent"

Here is my code, can anyone give me a hand?

activate application "System Preferences"
tell application "System Events"
	set preferencesLocked to false
	tell process "System Preferences"
		delay 1
		click menu item "Security & Privacy" of menu "View" of menu bar 1
		delay 2.5
		if title of button 4 of window 1 is "Click the lock to make changes." then
			set preferencesLocked to true
			click button "Click the lock to make changes." of window 1
		end if
	end tell
	if preferencesLocked is true then
		delay 2.5
		activate application "SecurityAgent"
		tell application "System Events"
			tell process "SecurityAgent"
				set value of text field 1 of scroll area 1 of group 1 of window 1 to "username"
			end tell
		end tell
	end if
end tell

BTW: I have also posted it here http://stackoverflow.com/questions/7542334/applescript-unlocking-system-preferences just incase anyone follows stackoverflow and answers this questions and want their answer accepted.

Thanks for the help!!!