title: How to setBackground of Field in Blackberry 4.5?
body: <p>I have defined a BitmapButtonField in Blackberry. But the default grey color background does not go. And the Bluish onFocus border? 
  How to change them in BB 4.5</p>
  
  <p><img src="https://i.stack.imgur.com/9Abrz.png" alt="enter image description here"></p>