title: Use of a RadInputManager (telerik)
body: <p>i'm trying to use this control to check a time (HH:MM) a user inserts...</p>
  
  <p>This is what i'm using but not working </p>
  
  <pre><code>            &lt;telerik:RadTextBox ID="txtEstimation" runat="server"&gt;
              &lt;/telerik:RadTextBox&gt;
              &lt;telerik:RadInputManager ID="RadInputManager1" runat="server"&gt;
                  &lt;telerik:RegExpTextBoxSetting EmptyMessage="EmptyMessage" ValidationExpression="(([01][0-9])|(2[0-3])):[0-5][0-9]"
                      ErrorMessage="*"&gt;
                      &lt;TargetControls&gt;
                          &lt;telerik:TargetInput ControlID="txtEstimation" /&gt;
                      &lt;/TargetControls&gt;
                  &lt;/telerik:RegExpTextBoxSetting&gt;
              &lt;/telerik:RadInputManager&gt;
  </code></pre>
  
  <p>I was inspired by this : <a href="http://www.telerik.com/help/aspnet-ajax/input-inputmanager-basics.html" rel="nofollow">http://www.telerik.com/help/aspnet-ajax/input-inputmanager-basics.html</a>
  Thanks in advance for your help</p>