title: Custom validator is not firing even the textbox is not empty
body: <p>I have a cutomvalidator, textbox.text = 1 and a subroutine:</p>
  
  <pre><code>1.
  asp:TextBox id="tbxNumber" runat="server" MaxLength="100
  
  2.
  asp:CustomValidator id="vNumeric" runat="server" ControlToValidate="tbxNumber" Display="None" OnServerValidate="ValidateNumbers2"
  
  3.
  Sub ValidateNumbers2(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
  
  If Not IsNumeric(args.Value) Then  
  
    args.IsValid = False
  
  Else
  
     args.IsValid = True
  
  End If
  
  
  End Sub
  </code></pre>
  
  <p>When I try to debug vNumeric.Validate, sub ValidateNumbers2 won't fire? Why?</p>
  
  <p>Ideas? I'm wasting my too much time on this little problem. I only have to use customvalidator for some reasons.</p>