how to add my own userfeedback(ConversionActivity)

Follow the Android Feedback SDK Installation Guide:
we must do three things:
1.Add.jar
2.Add resource
3.Add Activity to AndroidManifest.xml
    <activity android:name="com.umeng.fb.ConversationActivity"/>
    <activity android:name="com.umeng.fb.ContactActivity"/>
4.Add Permissions
5.Add  the below two lines to realation place such as one button.onclickListener
    FeedbackAgent agent = new FeedbackAgent(context);
    agent.startFeedbackActivity();

My question is ConversationActivity is in the jar,and the umeng_fb_activity_conversation.xml is in the res directory,so if i want to add my own feedback UI ,how to do it.

My solution is modify the umeng_fb_activity_conversation.xml to what i want,but ConversationActivity which in com.umeng.fb will be called aumatically ,so if the .xml is modified ,and some widget cannot be find when the ConversationActivity is called.

How to solve it.