I'm trying to use AJAX and a MultiView control together.  I've created a small example, listed below.   If I remove the AJAX in my Page_Load, the code works.  But if I enable the AJAX the views will no longer retain their field views when I change between the views.

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ascx.vb code:

Imports DotNetNuke

Namespace XYZ

    Partial Class AjaxTest
        Inherits Entities.Modules.PortalModuleBase

        Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
            Try

                '--- remove this section to see it work ---
                If DotNetNuke.Framework.AJAX.IsInstalled Then
                    DotNetNuke.Framework.AJAX.RegisterScriptManager()
                    DotNetNuke.Framework.AJAX.WrapUpdatePanelControl(PanelMain, True)
                    DotNetNuke.Framework.AJAX.RegisterPostBackControl(txtAmounToPay)
                End If

                If Not Page.IsPostBack Then
                    MultiView1.SetActiveView(view1)           
                    txtAmounToPay.Text = "100.00"
                    ComputeFee()
                End If

            Catch exc As Exception
                ProcessModuleLoadException(Me, exc)
            End Try
        End Sub

        Private Sub ComputeFee()
            Dim amount As Decimal = 0
            Dim tax As Decimal = 0
            Dim total As Decimal = 0

            Try
                amount = CType(txtAmounToPay.Text, Decimal)
                tax = amount * 0.07
                total = amount + tax
            Catch ex As Exception
            End Try

            lblTax.Text = tax
            lblTotal.Text = total
        End Sub

        Protected Sub txtAmounToPay_TextChanged(ByVal sender As Object, ByVal e As EventArgs) Handles txtAmounToPay.TextChanged
            ComputeFee()
        End Sub

        Protected Sub Button2_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button2.Click
            MultiView1.SetActiveView(view1)
        End Sub

        Protected Sub Button3_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button3.Click
            MultiView1.SetActiveView(view2)
        End Sub

    End Class

End Namespace

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.asc.vb

<%@ Control Inherits="XYZ.AjaxTest" Language="vb" AutoEventWireup="false"
    Explicit="True" CodeBehind="AjaxTest.ascx.vb" %>
<asp:Panel ID="PanelMain" runat="server">
    <asp:MultiView ID="MultiView1" runat="server">
        <asp:View ID="view1" runat="server">
            <asp:Panel ID="Panel3" runat="server" BackColor="#CCFFFF">
                View #1 ------------<br />
                List of products, etc, etc.....
            </asp:Panel>
        </asp:View>
        <asp:View ID="view2" runat="server">
            <asp:Panel ID="Panel1" runat="server" BackColor="Lime">
                View #2 ------------
                <table width="100%">
                    <tr>
                        <td>
                            Sub Total:
                        </td>
                        <td>
                            <asp:TextBox ID="txtAmounToPay" runat="server" AutoPostBack="True">0.00</asp:TextBox>
                            &nbsp;&nbsp;&nbsp;
                        </td>
                    </tr>
                    <tr>
                        <td>
                            Tax:
                        </td>
                        <td>
                            <asp:Label ID="lblTax" runat="server" Text="0.00"></asp:Label>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            Total:
                        </td>
                        <td>
                            <asp:Label ID="lblTotal" runat="server" Text="0.00"></asp:Label>
                        </td>
                    </tr>
                </table>
            </asp:Panel>
            <asp:Panel ID="Panel2" runat="server">
            </asp:Panel>
        </asp:View>
    </asp:MultiView>
    <asp:Button ID="Button2" runat="server" Text="View 1" />
    &nbsp;
    <asp:Button ID="Button3" runat="server" Text="View 2" />
</asp:Panel>
 

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VS2008 / DNN v 4.9.1