title: Misunderstanding of .net checkbox
body: <p>Situation is as follows:</p>
  
  <p>I have form on which is tabcontrol and inside firs tab with autoscroll property=true  is complex GUI where first control is checkbox. I uses windows 7 with default theme and I don't see anyhow when checkbox is focused. And more, key events for this control don't work at all so when I press key.Up focus automatically jumps to last control on my gui and I would like to stop focus at checkbox. But e.keycode = keys.Up under keydown event of checkbox was never fired so I can't set e.handled to true.</p>
  
  <p>Do I do something wrong or .net checkbox have "builtin issues"?
  On this checkbox tabindex is set to 0 and tabstop to true.  </p>