title: Issue with LostFocus event of a TextBox
body: <p>I'm trying to use this function: </p>
  
  <pre><code>private void IDCustTextBox_LostFocus(object sender, System.EventArgs e)
  {
        if (CustName.Text == "abc")
            MessageBox.Show("Error");
  }
  </code></pre>
  
  <p>When I type abc in <code>CustName</code> textbox, and then leave the textbox, I dont get any message. In the textbox properties I can see that "textbox.Changed" is using the event LostFocus.</p>
  
  <p>How can I get this to show the Error message above?</p>