title: UITextField clearButtonMode color
body: <p>can I change the color of the clearButtonMode on a textField?</p>
  
  <pre><code>theTextField.clearButtonMode = UITextFieldViewModeWhileEditing
  </code></pre>
  
  <p>shows an x that is grey dark color to delete the textField,</p>
  
  <p>but can i show this button with white color?</p>
  
  <p>thanks</p>