Improper transition from Activity to Fragment Activity

I have MainActivity extends BaseActivity. BaseActivity extends SlidingFragmentActivity(using Sliding Manu Library)

MainActivty's setContentView is container.xml

I have 3 fragments. Fragement1 is set to container.xml at onCreate of MainActivity. container may contain only one fragment at a time.

Here I replace fragment1 with fragment3. And from fragment3 I have created NewActivity.

Problem is that when I press back button from newly created Activity, MainActivity comes in front with fragment1 but I want fragment3 instead of fragment1.

So what should I do to do this?