Find sidebar button in asp wizard sidebar

[anishps]

Hi all,
I have an asp wizard with many steps and with a sidebar template .
sidebar template is like this

<SideBarTemplate >
<aspataList ID="SideBarList" runat="server">
<ItemTemplate >
<asp:ImageButton AlternateText ="Test" ID="SideBarButton" runat="server" ImageUrl='<%#GetStepImage( (string)Eval("Title") )%>' />
<asp:Label ID="lblStepName" runat="server" Text='<%#GetStepTitle( (string)Eval("Title") )%>'></asp:Label>
</ItemTemplate>
<SelectedItemTemplate>
<asp:ImageButton ID="SideBarButton" runat="server" ImageUrl='<%#GetSelectedStepImage((string)Eval("Ti tle") )%>' />
<asp:Label ID="lblStepName" runat="server" Text='<%#GetStepTitle( (string)Eval("Title") )%>'></asp:Label>
</SelectedItemTemplate>
</aspataList>
</SideBarTemplate>



I need to change the image after next button click of each step from code behind.
How can we access the SideBarButton for the active step from code behind and change the url of that
I heve been playing around this issue for more than a day ..please help
Thanks,
Anish