Default [Q] Notificationbar in Car App - 4.4.2

After updating my HTC One to Android 4.4.2 ( ARHD 51.0) its not possible to pull down the Notificationbar inside the Car App, even if i open another App through the Car App e.g. Navigon.

Is this a bug or a new "feature"!?

Anyboy an idea how to solve this.
I often use the Car App and like to switsch Music Title in the Notification Bar or directly go to new messages while navigate with Navigon. At the moment i have to go back to the Car App and open music or any other app on this way.

I already tried some apps from the playstore which make it possible to launch the bar when in fullscreen mode, but they doesn´t work in the Car App.

Any ideas?