when I click one button and then showModalDialog wjhen I close this modaldialog window,the RadAjaxLoadingPanl appear。I don't want it to appear.
I set this in masterPage but it no use
<telerik:AjaxSetting AjaxControlID="button">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="RadAjaxLoadingPanel1" />
                </UpdatedControls>
            </telerik:AjaxSetting>

In content page :
<td style="width: 500px; height: 30px;">
                                                        <telerik:RadAjaxPanel ID="rapText" runat="server">
                                                            <telerik:RadComboBox ID="rcbText" runat="server" Width="493px" Style="height: auto;"
                                                                MarkFirstMatch="true" OnLoad="rcbText_Load" EnableLoadOnDemand="true" EmptyMessage="documentSelectionListBox "
                                                                AutoPostBack="True" OnSelectedIndexChanged="rcbText_SelectedIndexChanged"
                                                                Skin="WebBlue" MaxHeight="100px">
                                                            </telerik:RadComboBox>
                                                        </telerik:RadAjaxPanel>
                                                    </td>
                                                    <td>
                                                        <asp:Button ID="button" runat="server" Style="width: 75px; text-align: center; height: 25px;" Text="btnText" />
                                                    </td>

 function showPage() {
                var result = window.showModalDialog("Text.aspx", "", "dialogWidth:400px;dialogHeight:" + dialogheight + "px;toolbar=no,title:no;location=no;scroll:no;status:no;menubar=no;resizable:no;");
                var s = document.getElementById("<%=txtText.ClientID %>");
                s.Text = result;
                $find("<%=rapText.ClientID %>").ajaxRequest("ctl00_ContentPlaceHolder1_button");
            }
content code behind
this.button.Attributes.Add("onclick", "return showPage()");

Hi Diana,

There are some known issues when using both the manager and the panel in some complex applications - MasterPage or WebUserControls. However, note that a single RadAjaxManager (and no panels) in the master/main page could handle all the scenarios. Also please note that you should not add RadAjaxLoadingPanel as ajax initiator or updated control into the RadAjaxManager settings. It should be add only ad default LoadingPanel for the Manager or as LoadingPanelID to a specific Ajax setting.

All the best,
Maria Ilieva
the Telerik team