+ <activity
+ android:name="com.example.myfirstapp.DisplayMessageActivity"
+ android:label="@string/title_activity_display_message"
+ android:parentActivityName="com.example.myfirstapp.MainActivity" >
+ <meta-data
+ android:name="android.support.PARENT_ACTIVITY"
+ android:value="com.example.myfirstapp.MainActivity" />
+ </activity>