WPFComboBox下拉列表

 　　　　<ComboBox x:Name="hello1" Margin="126,89,-126,-89">
            <ComboBoxItem>ComboBox Item #1</ComboBoxItem>
            <ComboBoxItem IsSelected="True">ComboBox Item #2</ComboBoxItem>
            <ComboBoxItem>ComboBox Item #3</ComboBoxItem>
        </ComboBox>