Thanks Atconway, I have a pretty much the same kind of code.

MY ASPX page:

<updatePanel runat="server">

<asp:Panel runat="server">

<asp:Button ID="btnDisplayDetails" runat="server" Text="Display Details" OnClick="btnDisplayDetails_Click" />

<asp:MultiView ID="mv" runat="server">

<asp:View ID="view1" runat="server">

</asp:View>

<asp:View ID="view2" runat="server">

</asp:View>

</asp:MultiView>

</asp:Panel>

</updatePanel>

MY CODE BEHIND:

Protected Sub btnDisplayDetails_Click(ByVal sender As Object, ByVal e As EventArgs)

Me.mv.SetActiveView(Me.view1)

End Sub