twitter: [android-developers] change color of DatePickerDialog widget

How to change the change color of DatePickerDialog widget? In docs
there is one constructor which has theme field

public DatePickerDialog (Context context, int theme,
DatePickerDialog.OnDateSetListener callBack, int year, int
monthOfYear, int dayOfMonth)

But when I tried for different theme value then only size of
DatePickerDialog widget changes. If I want to change the color then
how to do this?
Thanks