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I spend a fair amount of time before figuring out how to implement a Menu Item that would trigger a Post Back Event.  So, thanks to Powlo's blog, SharePoint Users Group and the MSDN forum.

My overall goal was to implement a "Delete" MenuItemTemplate that triggers a Event on the server.  Here are the steps for my implementation:

1. Implement the IPostBackEventHandler and its RaisePostBackEvent method.
2. Add the MenuItemTemplate as follow in the aspx file:

<SharePoint:MenuItemTemplate ID="DeletePortfolioMenuItem"
                                     runat="server"
                                     Text="Delete"
                                     Description="Delete this Portfolio"
                                     ImageUrl="/_layouts/images/delitem.gif"
                                     Sequence="2"
                                     ClientOnClickPostBackConfirmation="Are you sure you want to delete this item?"
                                     ClientOnClickUsingPostBackEvent="__page,%Name%" />

Or in the codebehind by setting the ClientOnClickPostBackConfirmation and ClientOnClickUsingPostBackEvent in the CreateChildControls method:

protected override void CreateChildControls()
{
    base.CreateChildControls();

    DeletePortfolioMenuItem.ClientOnClickPostBackConfirmation = "Are you sure you want to delete this item?";
    DeletePortfolioMenuItem.ClientOnClickUsingPostBackEvent = "__page,%Name%";
}

The %Name% parameter is used here as the TokenNameAndValueFields in the SPMenuField of the SPGridView.  Its value is passed to the Event Argument of the RaisePostBackEvent method.

Note: The functionality can also be implemented with the ClientOnClickScript as follow:

DeletePortfolioMenuItem.ClientOnClickScript = "if (confirm('Are you sure you want to delete this item?')) __doPostBack('" + this.UniqueID + "','%Name%')";