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Horintal scrollview END point and start point

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i have Horizontal scrollview with 50 controll,as i am scroll it will display 50 gracefully.but at initially user not able to understand that this is scrollview and "I need to scroll for next item". so i have simply put two image at Right side and left side as you can see in image.now my problem is "i don't able to understand that how can i invisible left side arrow to visible & invisible right side arrow".




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