ASP.Net AJAX Editor Control OnContentChange event not working

sir,

i have try like below.

<cc1:Editor ID="Editor1" runat="server" 
        oncontentchanged="Editor1_ContentChanged" />
    <asp:Literal ID="Literal1" runat="server"></asp:Literal>

code behind.

protected void Editor1_ContentChanged(object sender, EventArgs e)
    {
        Literal1.Text = Editor1.Content;

    }

it's not working.