Sliding menu sliding to full screen android with sliding menu library

I am using Sliding menu library. When sliding the screen entire activity layout going to right side. But I want to fix the header at top and only need to go the remaining part. My Sliding screen code is

    setBehindContentView(R.layout.sliding_screen);
    menu = getSlidingMenu();

    menu.setMode(SlidingMenu.LEFT);
    menu.setShadowWidthRes(R.dimen.shadow_width);
    // menu.setShadowDrawable(R.drawable.ic_launcher);
    menu.setBehindOffsetRes(R.dimen.slidingmenu_offset);
    menu.setFadeDegree(0.35f);
    setSlidingActionBarEnabled(true);

and I am included the header in layout

 <include
    android:id="@+id/include1"
    android:layout_width="fill_parent"
    android:layout_height="50dp"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    layout="@layout/header_layout" />