When using a context menu I want to modify an item in the menu list so I am trying this:

private void ribbonContextMenu_Opening(object sender, OpeningEventArgs e)
{
    XamContextMenu ribbonContextMenu = sender as XamContextMenu;
    XamMenuItem minimizeMenu = ribbonContextMenu.FindName("minimizeMenu") as XamMenuItem;
    if (MyRibbon.IsMinimized)
        minimizeMenu.Header = "Expand Ribbon";
    else
        minimizeMenu.Header = "Minimize Ribbon";
}

However it fails to find the menuitem. What do I need to do here? It is quite annoying I cant just use the variable name as defined in the XAML but that is also NULL and I have read elsewhere on this forum that this is deliberate.

Please advise.

Doug Rees