I have an asp.net page with a TreeView that is bound to a SiteMapDataSource object.

What I would like to do is each time a user selects an item in the TreeView, automatically collapse all other branches that are not part of the selected item. I have spent the last day searching for possible solutions and am starting from scratch because either (a) it caused an "infinite loop" error or (b) it simply didn't do what I needed it to do.

Any help would be appreciated.

Here is the code showing the relevant objects:

<asp:SiteMapDataSource ID="smdsProdcutsMenu" runat="server" StartingNodeUrl="~/Products/products.aspx" />
<asp:TreeView ID="tvCategory" runat="server" CssClass="Treeview" NodeWrap="true" DataSourceID="smdsProdcutsMenu" ShowLines="True" ontreenodeexpanded="TreeNodeExpanded">
<SelectedNodeStyle BackColor="White" Font-Bold="True" ForeColor="Blue" />

Through testing, I have seen that the only event triggered by clicking on an item in the Treeview is TreeNodeExpanded.

The scriptblock is empty now because I am starting from square one and do not know what to put here. Here is where I need help.

<script runat="server">    
Protected Sub TreeNodeExpanded(sender As Object, e As System.Web.UI.WebControls.TreeNodeEventArgs)
' (1) what item was just clicked?
' (2) Collapse everything not contained in the branch of the selected item.
End Sub

Thank you for any help.

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