MS Ajax: RadioButton CheckedChanged not firing back with AJAX v1.0?

I saw a very interesting post on the Ajax forum. NXTwoThou had a problem with 2 radiobutton controls which must fire the OnCheckedChanged event. Here is the code.

    <script runat=”Server”>
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
                ddl_customers_specific.Items.Add(new ListItem(“Test”));
        }
        protected void rb_customers_all_CheckedChanged(object sender, EventArgs e)
        {
            ddl_customers_specific.BackColor = System.Drawing.Color.Red;
        }
        protected void rb_customers_specific_CheckedChanged(object sender, EventArgs e)
        {
            ddl_customers_specific.BackColor = System.Drawing.Color.Blue;
        }

    </script>
    <form id=”form1″ runat=”server”>
        <asp:ScriptManager runat=”server” ID=”sm” />

             <asp:RadioButton ID=”rb_customers_all” runat=”server” Text=”All Customers” AutoPostBack=”true”
             Checked=”true” GroupName=”g_Customers” OnCheckedChanged=”rb_customers_all_CheckedChanged” />        

<asp:RadioButton ID=”rb_customers_specific” runat=”server” Text=”Specific Customers” AutoPostBack=”true” GroupName=”g_Customers” OnCheckedChanged=”rb_customers_specific_CheckedChanged” />

<asp:UpdatePanel ID=”up_customer” runat=”server” UpdateMode=”conditional”>
               <ContentTemplate>
                      <asp:DropDownList ID=”ddl_customers_specific” runat=”server” />
               </ContentTemplate>
               <Triggers>
                      <asp:AsyncPostBackTrigger ControlID=”rb_customers_all” EventName=”CheckedChanged” />
                      <asp:AsyncPostBackTrigger ControlID=”rb_customers_specific” EventName=”CheckedChanged” />
               </Triggers>
          </asp:UpdatePanel>
     </form>

The problem is that the radio button “rb_customers_all” has the property checked set to true. When this is set to true the event will never get fired. removing this property and adding the following code “rb_customers_all.InputAttributes["checked"] = “true”;” will fix this problem.

Have fun!