Thanks
I attend a solution
<%
@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<%
@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>
<!
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></title>
<script type="text/javascript">
function SetFirstRowActive() {
alert(
"ee");
var grid = $find("RadGrid1.ClientID");
grid.set_activeRow(grid.MasterTableView.get_dataItems()[0].get_element());
}
</script>
</
head>
<
body onload="SetFirstRowActive">
<form id="form1" runat="server">
<div style="height: 114px">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<telerik:RadGrid ID="RadGrid1" runat="server" DataSourceID="SqlDataSource1"
GridLines="None">
<
MasterTableView AutoGenerateColumns="False" DataKeyNames="Id_Categoria"
DataSourceID="SqlDataSource1">
<
RowIndicatorColumn>
<
HeaderStyle Width="20px"></HeaderStyle>
</
RowIndicatorColumn>
<
ExpandCollapseColumn>
<
HeaderStyle Width="20px"></HeaderStyle>
</
ExpandCollapseColumn>
<Columns>
<telerik:GridBoundColumn DataField="Id_Categoria" DataType="System.Int32"
HeaderText="Id_Categoria" ReadOnly="True" SortExpression="Id_Categoria"
UniqueName="Id_Categoria">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="Categoria" HeaderText="Categoria"
SortExpression="Categoria" UniqueName="Categoria">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="InizCat" HeaderText="InizCat"
SortExpression="InizCat" UniqueName="InizCat">
</telerik:GridBoundColumn>
</Columns>
</
MasterTableView>
<ClientSettings AllowKeyboardNavigation="true">
<Selecting AllowRowSelect="True" />
<Scrolling AllowScroll="True" UseStaticHeaders="True" />
</ClientSettings>
<
FilterMenu EnableTheming="True">
<
CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation>
</
FilterMenu>
</telerik:RadGrid>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="Data Source=WINXPSP2NET;Initial Catalog=Example;Persist Security Info=True"
ProviderName="System.Data.SqlClient"
SelectCommand="SELECT [Id_Categoria], [Categoria], [InizCat] FROM [Categoria_Libri]">
</asp:SqlDataSource>
</div>
</form>
</
body>
</
html>