Lisandro,
Try disable the save button and use <asp:Button> control.
<%@ Page Language="VB" MasterPageFile="~/Principal.master" Title="Untitled Page" MaintainScrollPositionOnPostback="true" %>
<%@ Register Assembly="CuteEditor" Namespace="CuteEditor" TagPrefix="CE" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<CE:Editor id="Editor1" DisableItemList="Save" runat="server"></CE:Editor>
<asp:Button ID="Button1" runat="server" Text="Button" />
</asp:Content>
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