Android - Navigation Drawer - ScrollView No Scrolling

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http://stackoverflow.com – i have a problem with a navigation drawer. I cant scroll inside the navigation drawer ... but i have enough items in my listview. I've checked my xml's but havent find any cause for the problem. Here is my "main" XML where the ListView is defined: <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com /apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/fragView" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".Hauptmenue_extended" > <ListView android:id="@+id/left_drawer" a (HowTos)