Extending the mxmlc warning to apply to any application that uses a type selector (i.e. not a universal selector) in the subject when the
QE: If we could create a negative test cases for the warning that'd be great.
Doc: Not yet, this will be captured in the Advanced CSS spec.
mustella: Advanced CSS, Button, MenuBar all Pass
Reviewer: For Paul.
SDK-19272 - [Advanced CSS] Pseudo selectors shouldn't be allowed in mxml components