title: Picker cannot accept borderRadius form style
body: <p>I am new in react native. I need to have a dropdownlist that read from a file.js. I used picker as below:</p>
  
  <pre><code>&lt;Picker
  style={Commonstyles.dropdownStyle}
  mode="dropdown"
  selectedValue={this.state.PickerValueHolderCity}
  onValueChange={(itemValue, itemIndex) =&gt; this.setState({PickerValueHolderCity: itemValue})}&gt;
  { console.log("mydataxxx", mydata) &amp;&amp; this.renderPickerItemsCity(mydata)}
  
  &lt;/Picker&gt;
  </code></pre>
  
  <p>Everything works fine for me. My problem is that I need to apply a style with gray background and curve ages. 
  However, it shows me just the gray background without curve border.</p>
  
  <p>I used the following style for it:</p>
  
  <pre><code>  dropdownStyle: {
      //flex: 1,
      backgroundColor: '#ecf0f1',
      marginBottom: 7,
      padding: 7,
      alignSelf: "stretch",
      // Set border width.
      borderWidth: 1,
      // Set border Hex Color Code Here.
      borderColor: '#bdc3c7',
      // Set border Radius.
      borderRadius: 10 ,
      //  marginBottom: 10,
    },
  </code></pre>
  
  <p>Can you please help me to apply the following style on picker. I should mention that, my style works fine on my textbox. </p>