[Mirroring] MX and Spark controls arent hinting a layoutDirection style

Found in 4.5.0.14142.

Steps to reproduce:
1. Copy and paste the attached MXML file into a new Builder project.
2. You dont get any code hints for layoutDirection being a style, making it a bit tricky in CSS since you cant use code completion.

Actual Results:
The layoutDirection property/style isnt hinted as a style. This means that when trying to style an Alert, it isnt immediately obvious how you can do that w/ CSS. It should hint "layoutDirection" or more probably "layout-direction".

Expected Results:
CSS hints.

Workaround (if any):
Set it in CSS regardless of hinting.
Set the layoutDirection property on the Alert by using something like this:

var a:Alert = Alert.show("Lorem ipsum dolor sit amet, consectetur adipiscing elit.", "Alert title", Alert.OK|Alert.CANCEL);
a.status = "foo";
a.layoutDirection = "rtl";