title: How to set the focus on a form
body: <p>I want to set the focus on a popup form I have created when the mouse hover it,
  I checked MSDN and they said to use the <em>SetFocuse</em> method but it does not work.</p>
  
  <p>I tried this:</p>
  
  <pre><code>private void POPUPmainmanue_MouseHover(object sender, EventArgs e)
      {
          POPUPmainmanue.SetFocus();
      }
  </code></pre>