OSX Mavericks - keyboard shortcut to kill notifications

This used to work:

tell application "System Events"
    tell process "NotificationCenter"
        click at {2500, 50}
    end tell
end tell

But in Mavericks it gives me "System Events got an error: Can’t make {2500, 50} into type list." I finally found a fix, though:

tell application "System Events"
    tell process "NotificationCenter"
       click button "Close" of window 1
    end tell
end tell

That closes the bottommost notification, which is good enough for me.

Also handy is this script to nuke 'em all:

tell application "System Events"
    tell process "NotificationCenter"
        set numwins to (count windows)
        repeat with i from numwins to 1 by -1
            click button "Close" of window i
        end repeat
    end tell
end tell

You can use a script like this to click a notification:

tell application "System Events" to click window 1 of process "NotificationCenter"

It closes both banner and alert notifications that don't have a default action, but it performs the default action (like opening App Store for the "OS X Updates Available" notifications) if a notification has a default action.