title: How to refresh a winform custom control at design time after changing a property
body: <p>Let's say I create a custom control which embed a trackbar. I also create an orientation property for my custom control. 
  When I drop the custom control on a form by default it will be horizontal. Then I set it to vertical, the trackbar should refresh to be vertical at design time.</p>
  
  <p>How to do so ?</p>