With the API18 SDK Google released a new support library (support-v7) which includes classes for a native Actionbar for systems since Android 2.1
To use this Actionbar the Activity has to be extended from ActionbarActivity so to use this ActionBar in a B4A project B4A needs native support for it. The support-v7 library also contains resources. Hopefully there is a way to include them in the B4A project.
Here is a good documentation on how the new Actionbar can be used: http://developer.android.com/guide/topics/ui/actionbar.html
To use this Actionbar the Activity has to be extended from ActionbarActivity so to use this ActionBar in a B4A project B4A needs native support for it. The support-v7 library also contains resources. Hopefully there is a way to include them in the B4A project.
Here is a good documentation on how the new Actionbar can be used: http://developer.android.com/guide/topics/ui/actionbar.html