title: How I set focus on previous textbox control by using Shift + Tab key?
body: <p>I show you my code by which I send my cursor focus on next control but I want to set focus on previous control by pressing shift + tab key.</p>
  
  <pre><code>protected override bool ProcessTabKey(bool forward)
      {
          Control ctl = this.ActiveControl;
          if (ctl != null &amp;&amp; ctl is TextBox)
          {
              TextEdit tb = (TextEdit)ctl.Parent;
              if (SelectTextBoxes.Contains(tb) &amp;&amp; tb.Text.Length == 0)
              {
                  return true;
              }
          }
          return base.ProcessTabKey(forward); // process TAB key as normal
      }
  </code></pre>