I am using Radgrid and refresh button
On refresh is used radajaxmanager and radloading panel .
when i click on refersh button it gives error as
Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method
The code are follows.
<telerik:RadAjaxManager ID="rdAjaxManagerHistoryGrid" runat="server" EnableAJAX="true" DefaultLoadingPanelID="LoadingPnlCustom" >
<ajaxsettings>
<telerik:AjaxSetting AjaxControlID="rGridHistories">
<updatedcontrols>
<telerik:AjaxUpdatedControl ControlID="rGridHistories"
LoadingPanelID="LoadingPnlCustom" /></updatedcontrols></telerik:AjaxSetting>
<telerik:AjaxSetting AjaxControlID="btnRefreshHistory">
<updatedcontrols>
<telerik:AjaxUpdatedControl ControlID="rGridHistories"
LoadingPanelID="LoadingPnlCustom" /></updatedcontrols></telerik:AjaxSetting>
</telerik:RadAjaxManager>
<telerik:RadAjaxLoadingPanel ID="LoadingPnlCustom" runat="server"
BackColor="control" Transparency="15">
<asp:Image ID="imgCustom" runat="server"
ImageUrl="~/images/loadingFinal.gif" />
</telerik:RadAjaxLoadingPanel>
<telerik:RadGrid ID="rgridHistories1" runat="server" Visible="false"
AllowAutomaticDeletes="True" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" BorderColor="AntiqueWhite"
ClientSettings-EnableClientKeyValues="true"
GridLines="None" Height="349px"
LoadingTemplateTransparency="15" PageSize="20" ShowStatusBar="True"
skin="Outlook" Width="91%">
<mastertableview clientdatakeynames="UniqueId,UserName"
DataKeyNames="UniqueId,UserName" editmode="InPlace" gridlines="Both">
<parenttablerelation>
<telerik:GridRelationFields />
</parenttablerelation>
<rowindicatorcolumn visible="False">
<HeaderStyle Width="20px" />
</rowindicatorcolumn>
<expandcollapsecolumn resizable="False" visible="False">
<HeaderStyle Width="20px" />
</expandcollapsecolumn>
<Columns>
<telerik:GridBoundColumn DataField="Uniqueid" HeaderText="UniqueId"
ReadOnly="True" UniqueName="Uniqueid" Visible="False">
</telerik:GridBoundColumn>
<telerik:GridTemplateColumn AutoPostBackOnFilter="True"
ColumnEditorID="chkHistoryReviewedID" DataType="System.Boolean"
HeaderText="Reviewed" UniqueName="Reviewed">
<ItemTemplate>
<asp:CheckBox ID="chkHistory" runat="server" AutoPostBack="True"
Checked="false" OnCheckedChanged="History_CheckBox_Check" />
</ItemTemplate>
</telerik:GridTemplateColumn>
<telerik:GridButtonColumn ButtonType="ImageButton" CommandName="EditHistory"
HeaderText="Edit" ImageUrl="~/images/ico_16_customEntity.gif"
Text="Update History" UniqueName="EditColumn">
</telerik:GridButtonColumn>
<telerik:GridBoundColumn DataField="ManagerNotes" HeaderText="Manager Note"
UniqueName="ManagerNotes" Visible="False">
<ItemStyle Font-Bold="False" Font-Italic="False" Font-Names="Verdana"
Font-Overline="False" Font-Size="X-Small" Font-Strikeout="False"
Font-Underline="False" ForeColor="DarkGray" HorizontalAlign="Center"
Wrap="True" />
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="UserName" HeaderText="User" ReadOnly="True"
UniqueName="UserName">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="Subject" HeaderText="Subject"
ReadOnly="True" UniqueName="Subject">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="RecordedForUserUniqueId"
HeaderText="Recorded For User Unique ID"
ReadOnly="True" UniqueName="UserUniqueId" Visible="False">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="RecordedwithContactUniqueId"
Display="False"
HeaderText="Recorded with Contact Unique ID"
ReadOnly="True" UniqueName="ContactUniqueID">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="Company" HeaderText="Company"
ReadOnly="True" UniqueName="Company">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="ContactName" HeaderText="Contact Name"
ReadOnly="True" UniqueName="ContactName">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="HType" HeaderText="Type" ReadOnly="True"
UniqueName="Type">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="Notes" HeaderText="Details" ReadOnly="True"
UniqueName="Details">
<HeaderStyle Width="150px" />
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="RecordedTime" HeaderText="Recorded Time"
ReadOnly="True" UniqueName="RecordedDate">
</telerik:GridBoundColumn>
<telerik:GridHyperLinkColumn HeaderText="Attachment"
UniqueName="AttachmentColumn">
</telerik:GridHyperLinkColumn>
</Columns>
<editformsettings>
<editcolumn autopostbackonfilter="True" uniquename="EditCommandColumn1">
</editcolumn>
</editformsettings>
</mastertableview>
<clientsettings allowcolumnsreorder="True">
<selecting allowrowselect="True" />
<scrolling allowscroll="True" usestaticheaders="True" /></clientsettings>
<PagerStyle Mode="NextPrevAndNumeric" Position="Top"
PrevPageText="&lt; " /><EditItemStyle BorderColor="#C0C0FF"
BorderStyle="Inset" Font-Bold="False" Font-Italic="False" Font-Overline="False"
Font-Strikeout="False" Font-Underline="False" Wrap="True" />
<SelectedItemStyle BackColor="LightGray" Font-Bold="False"
Font-Italic="False" Font-Overline="False" Font-Strikeout="False"
Font-Underline="False" Wrap="True" /></telerik:RadGrid>