applescript UI event

test1

tell application "System Events" to tell process "Messages"
	set input to "how are you" as text
	click button 1 of group 1 of splitter group 1 of window 1
	delay 1
	keystroke "8618640957111,8613552220268" -- type the reciever
	keystroke return -- validate the previous input
	--keystroke tab -- move to message input
	--keystroke input -- type the message
	--keystroke return
	--keystroke return
end tell