title: UserControl, cursor at tabnavigation
body: <p>In my window there are two <code>textbox</code> and my <code>usercontrol</code>.</p>
  
  <p><a href="https://i.stack.imgur.com/gXAgm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gXAgm.png" alt="1"></a>
  </p>
  
  <p>Once the cursor is <code>TextBox1</code>. When I click Tab cursor is in my <code>UserControl</code>, but cursor remains stable on <code>TextBox</code>(like <code>|</code> without blink). When I click next Tab cursor only in <code>TextBox2</code>. If I move cursor from <code>TextBox1</code> to my <code>usercontrol</code> - all right. The problem is in my component, but I don't know what it is.</p>