How to set viewpager fragment Layout size?

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http://stackoverflow.com – I have 3 fragments, my default is second; I want that, third fragment, layout width is only 50dp, and I can't scroll more that 50dp to left. It's like in dolphin browser:from right or left side you scroll bookmarks or something else, but it scrolls only 20% of screen? How I can do that?? (HowTos)