Dart Plugin - Missing method parameters informations while typing Follow

The Dart Plugin is missing the method parameters informations that should displayed while typing inside the braces.

For example if I put the cursor inside the braces of the button.setStyleName() method (example used: dart_web_toolkit_showcase package), no info box appears above the text line containing the method, asyou can see in this screenshot:


In the original google DartEditor, the same project, shows correctly the method parameters informations:



Solution:
- The ide must always display the information about the methods parameters when the cursor is inside the method braces.

Environment:
OSX Maverick
IntelliJ IDEA 13
Plugin: Dart 133.239


Thank you.