title: How to make MouseWheel work on the scrollbar
body: <p>I am running an application in C# and I need to add Mouse Wheel functionality for a scroll bar. </p>
  
  <p>I set <code>Focus()</code> on some controls from the window where I need that scroll. And still, it doesn't work. But if a minimize the application and maximize again and scroll without any other click it works. </p>
  
  <p>If I click any other control, I cannot use the mouse wheel functionality on the scroll bar. Also, I put <code>Refresh()</code> on some controls. </p>
  
  <p>What can be the problem and what is the solution?</p>