Finally figured it out! Considered PagerTabStrip instead of PagerTitleStrip.
tabStrip = (MyPagerTabStrip) findViewById(R.id.pager_title_strip);
tabStrip.setBackgroundColor(Color.rgb(240, 240, 240));
tabStrip.getChildAt(1).setPadding(30, 15, 30, 15);
tabStrip.getChildAt(1).setBackgroundResource(R.drawable.background_orange);
tabStrip.setDrawFullUnderline(false);
tabStrip.setTabIndicatorColor(Color.rgb(240,240,240));
Took one day to research on it!