UIpickerview size is not reduced in iphone os 4.0 -

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i need reduce size of uipickerview.

for use code 

picker = [[uipickerview alloc] init]; picker.frame = cgrectmake(0, 0, 100, 100);

it not reduce in os 4.0 , test in os 3.0 reduced.

what wrong,how can reduce size of uipickerview in iphone os 4.0.

can 1 please me.

thank u in advance.

see how change uipickerview height


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