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first of all on a simple screen with some buttons placed horrizontaly.say b1 ,b2, b3, b4.below that button(verticaliy)there will be some content which should hidden first but As soon as i go to b1 there should be one transperent layer comming and showing content of the b1.& when i go out from b1 to b2 the layer shoud show the same effect like b1.