Call the code below will recreate the datagrid again.
$('#dgList').datagrid({
singleSelect:true
});
You can set the 'title' property while creating the datagrid.
$('#dgList').datagrid({
title: '...',
singleSelect:true
});
If you only want to change the selecting mode, please set the 'singleSelect' property instead of recreating the whole datagrid again.
$('#dgList').datagrid('options').singleSelect=true;