question on collasiblepanelextender

Ok, right now I have a control, the CollasiblePanelExtender, on a page, and it works fine like this:

<AjaxControl:CollapsiblePanelExtender ID="CollapsiblePanelExtender1" runat="server" TargetControlID="pnlAssignedForums" Collapsed="true" ExpandDirection="Horizontal" ExpandControlID="gnlGroupTitle" CollapseControlID="gnlGroupTitle" TextLabelID="lblDetail" ExpandedText="(Hide Details...)" CollapsedText="(Show Details...)" SuppressPostBack="true" />

My question is, when I try to use the option ExpandDirection set equal to "Vertical," my control is already extended, and won't collapse. Is there a way around that? Btw, the panel that is used does work. It displays info out of a database, like only two lines.

so your saying that the panels that you want to expand and collapse render expanded at page load or is it something else.

Joshua