UIpickerview size is not reduced in iphone os 4.0

i am i need to reduce size of UIPickerview.

for that i use this code

picker = [[UIPickerView alloc] init];
picker.frame = CGRectMake(0, 0, 100, 100);

it is not reduce in os 4.0 and i test it in os 3.0 then it is reduced.

what the wrong,how can i reduce size of UIPickerview in iphone os 4.0.

can any on开发者_C百科e please help me.

Thank u in advance.

See How to change UIPickerView height