I have a GridTemplateColumn like following.

When I click the first edit image button, it work fine, but when I click the second one, it alert an error message,” Microsoft JScript runtime error: Object doesn't support this property or method.”

How to solve this problem?

Many thanks for your helping.

function EditCategory()
{
 var grid = $find("<%=RadGrid_Category.ClientID %>");
 var MasterTable = grid.get_masterTableView();

 var selectedRows = MasterTable.get_selectedItems();
 for (var i = 0; i < selectedRows.length; i++)
 {
  var row = selectedRows[i];
  var cell = MasterTable.getCellByColumnUniqueName(row, "CategoryID");
  var CategoryID= cell.innerHTML; //holds the value of the cell
 }

 window.radopen("EditCategory.aspx?
 CategoryId="+CategoryID, "EditCategory");   
}

<telerik:GridTemplateColumn HeaderText="Edit"  
 UniqueName="TemplateColumn">
 <ItemTemplate>
  <asp:ImageButton ID="ImageButton_Edit" runat="server"
  OnClientClick="EditCategory(); return false;"
  ImageUrl="/EditorPr.gif" />
 </ItemTemplate>
</telerik:GridTemplateColumn>

Line 24:     <tr align="left" bgcolor="#EFEFEF">
Line 25:       <td > <i><asp:Label ID="label1" runat="server" Text="Label"></asp:Label></i>
Line 26: <telerik:RadToolBar runat="server" id="toolbar1" AutoPostback="true" Skin="Office2007" UseFadeEffect="True" >

@ Page Language="C#" AutoEventWireup="true" CodeFile="Admin-Registration-Account-Master.aspx.cs" Inherits="_Default" %>

<%

@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>

<%

@ Register TagPrefix="edway" TagName="HeadTag" Src="HeadTag.ascx" %>

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<

html xmlns="http://www.w3.org/1999/xhtml" >

<

head runat="server"><title>Registration Master</title></head>

<

edway:HeadTag runat="server" ID="Headtag"></edway:HeadTag>

<

body>

<

form id="form1" runat="server">

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>

<table align="left" class="style1">

<tr align="left" bgcolor="#EFEFEF">

<td > <i><asp:Label ID="label1" runat="server" Text="Label"></asp:Label></i>

<telerik:RadToolBar runat="server" id="toolbar1" AutoPostback="true" Skin="Office2007" UseFadeEffect="True" >

<items>

<telerik:RadToolBarButton Width="120px" DisplayType="TextOnly" AccessKey="n" Tooltip="New (Alt+N)" CommandName="New Student" />

<telerik:RadToolBarButton Width="120px" DisplayType="TextOnly" AccessKey="r" Tooltip="Return (Alt+R)" CommandName="Account Detail" />

<telerik:RadToolBarButton Width="120px" DisplayType="TextOnly" AccessKey="a" Tooltip="Accounts (Alt+A)" CommandName="Accounts" />

<telerik:RadToolBarButton Width="120px" DisplayType="TextOnly" AccessKey="s" Tooltip="Students (Alt+S)" CommandName="Students" />

</items>

</telerik:RadToolBar >