MenuItem click event not firing; other posts on subject not helpful

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C#

ASP.NET4

I'm setting the MenuItems for an asp:Menu dynamically. So here's the ASPX:

<asp:Menu ID="FlowMenu1" runat="server" CssClass="menu" EnableViewState="false" Visible="true" IncludeStyleBlock="false" Orientation="Horizontal" OnMenuItemClick="FlowMenu1Clicked">
    </asp:Menu>

... and here's a snippet from the code-behind:

MenuItem saveDraft1 = new MenuItem();
saveDraft1.Text = "Save Draft";
saveDraft1.Value = " ";

if ( ((position == "Employee") && ((documentState == "WORKING") ||
                                   (documentState == "DRAFT"))) ||
     ((position == "First Evaluator") && ((documentState == "NEW") ||
                                          (documentState == "REVIEW") ||
                                          (documentState == "CONVERSATION") ||
                                          (documentState == "CRITIQUE"))) ||
     ((position == "Second Evaluator") && ((documentState == "FEEDBACK") ||
                                           (documentState == "SCRUTINY"))) ||
     ((position == "Third Evaluator") && ((documentState == "REACTION") ||
                                          (documentState == "INSPECTION"))) )
{
    FlowMenu1.Items.Add(saveDraft1);
}

I've seen these problems suggested, but none of them have worked:

* The OnMenuItemClick procedure is defined (but when I put a breakpoint at the beginning of the procedure, it doesn't even seem like the event is firing)

* There's no AutoPostBack property to set on either the Menu or the MenuItem objects

* There's no NavigateUrl property set on the MenuItems (nor do I want there to be)

* There's no ImageUrl property set on the MenuItems (nor do I want there to be)

* Both the MenuItem.Text and the MenuItem.Value properties are set for all MenuItems

I've tried everything I can think of, including putting the menu control on its own panel. Thank you for any insight you can lend.