custom SWT component blinks when I interact with it
===

I'm building a small suite of widgets ([here][1]) for SWT...  
I've done a Slider, but everytime I change de value with the mouse wheel, it kinda blinks...  
The source is available here: https://github.com/germantech/ios-widgets/blob/master/br.com.germantech.iosWidgets.plugin/src/br/com/germantech/ioswidgets/slider/IOSSlider.java

What am I missing here?  
Thanks in advance


  [1]: https://github.com/germantech/ios-widgets