title: How to set up picker's border
body: <p>I have Picker from '<strong>react-native</strong>'. Picker.Item there are :<strong>"Monday, Tuesday, Wednesday etc"</strong>.</p>
  
  <p>I want to set up picker's properties like <code>borderRadius:10</code></p>
  
  <p>even <code>style={{borderRadius:30}}</code> not helped.</p>
  
  <pre><code>&lt;Picker
          style={styles.pickerStyle}
          tvParallaxTiltAngle
          selectedValue={this.props.shift}
          onValueChange={value =&gt; this.props.employeeUpdate({ prop: 
      'shift', value })}
        &gt;
          &lt;Picker.Item color="#A4A4A5" label="Monday" value="Monday" 
       /&gt;
          &lt;Picker.Item color="#A4A4A5" label="Thuesday" 
      value="Thuesday" /&gt;
          &lt;Picker.Item color="#A4A4A5" label="Wednesdady" 
      value="Wednesdady" /&gt;
          &lt;Picker.Item color="#A4A4A5" label="Thursday" 
      value="Thursday" /&gt;
          &lt;Picker.Item color="#A4A4A5" label="Friday" value="Friday" 
      /&gt;
          &lt;Picker.Item color="#A4A4A5" label="Saturday" 
      value="Saturday" /&gt;
          &lt;Picker.Item color="#A4A4A5" label="Sunday" value="Sunday" 
      /&gt;
  &lt;/Picker&gt;
  </code></pre>