title: Telerik control RasMaskedTextBox is not showing error message
body: <p>I am using CustomValidator for Telerik RadMaskedTextbox.The problem is that if i don't put any value , it doesn't show errormessage.</p>
  
  <pre><code>&lt;telerik:RadMaskedTextBox ID="RadMaskedTextBox3" runat="server"
                                          Width="150"
                                          Mask="(###) ###-####  ext. #####"&gt;
                                      &lt;/telerik:RadMaskedTextBox&gt;
   &lt;asp:CustomValidator ID="CustomValidator4" runat="server"                                        
                                          ErrorMessage="*"
                                          Display="Dynamic"
                                          CssClass="error1"
                                          Enabled="false"
                                          ToolTip="At least one Phone no: needs to be filled in."
                                          ValidateEmptyText="true"
                                          EnableClientScript="true"
                                          OnServerValidate="CustomValidator_ServerValidate"
                                          SetFocusOnError ="true"                                             
                                          ValidationGroup="CarrierBaseInformation1"&gt;
                                      &lt;/asp:CustomValidator&gt;
  </code></pre>