No resource identifier found for attribute 'actionViewClass'

i am getting error in my xml file i have mentioned the min sdk to 11 and i have included v4 support library also its pinching my head please help me

<item
    android:id="@+id/action_search"
    android:orderInCategory="100"        
    android:title="@string/action_search"
    myapp:actionViewClass="android.support.v7.widget.SearchView"
    myapp:showAsAction="always" />



<item
    android:id="@+id/action_settings"
    android:orderInCategory="100"
    android:showAsAction="never"
    android:title="@string/action_settings"/>