Hi Scott,
It is not possible to subscribe to ItemClicked event using Razor syntax, because it is not defined as a component Parameter and it cannot be as it is “event” type. It is possible to subscribe to the event using the syntax I sent you. ItemClicked way to subscribe to events is useful only when you want to add multiple event handlers.
For Example:

@page "/menu"
<Example Name="Menu">
	<Menu OnReady="OnReady" OnItemClick="OnItemClick" id="menu">
		<MenuItemsGroup>
			File
			<MenuItem Shortcut="Ctrl+N">New</MenuItem>
			<MenuItem Shortcut="Ctrl+0">Open</MenuItem>
			<MenuItemsGroup>
				Open Containing Folder
				<MenuItem>Explorer</MenuItem>
				<MenuItem>cmd</MenuItem>
			</MenuItemsGroup>
			<MenuItem Shortcut="Ctrl+S" disabled>Save</MenuItem>
			<MenuItem Shortcut="Ctrl+Alt+S" separator>Save As...</MenuItem>
			<MenuItem Shortcut="Alt+F4">Exit</MenuItem>
		</MenuItemsGroup>
		<MenuItemsGroup>
			Edit
			<MenuItem Shortcut="Ctrl+Z">Undo</MenuItem>
			<MenuItem Shortcut="Ctrl+Y" separator>Redo</MenuItem>
			<MenuItem Shortcut="Ctrl+X">Cut</MenuItem>
			<MenuItem Shortcut="Ctrl+C">Copy</MenuItem>
			<MenuItem Shortcut="Ctrl+V" disabled>Paste</MenuItem>
		</MenuItemsGroup>
		<MenuItemsGroup DropDownHeight=300>
			Encoding
			<MenuItem>Encode in ANSI</MenuItem>
			<MenuItem>Encode in UTF-8</MenuItem>
			<MenuItem>Encode in UTF-8-BOM</MenuItem>
			<MenuItem>Encode in UTCS-2 BE BOM</MenuItem>
			<MenuItem>Encode in UTCS-2 LE BOM</MenuItem>
			<MenuItemsGroup separator>
				Character sets
				<MenuItemsGroup>
					Cyrillic
					<MenuItem>ISO 8859-5</MenuItem>
					<MenuItem>KOI8-R</MenuItem>
					<MenuItem>KOI8-U</MenuItem>
					<MenuItem>Windows-1251</MenuItem>
				</MenuItemsGroup>
				<MenuItemsGroup>
					Chinese
					<MenuItem>Big5 (Traditional)</MenuItem>
					<MenuItem>GB2312 (Simplified)</MenuItem>
				</MenuItemsGroup>
				<MenuItemsGroup>
					Western European
					<MenuItem>ISO 8859-1</MenuItem>
					<MenuItem>ISO 8859-15</MenuItem>
					<MenuItem>OEM 850</MenuItem>
					<MenuItem>Windows-1252</MenuItem>
				</MenuItemsGroup>
			</MenuItemsGroup>
			<MenuItem>Convert to ANSI</MenuItem>
			<MenuItem>Convert to UTF-8</MenuItem>
			<MenuItem>Convert to UTF-8-BOM</MenuItem>
			<MenuItem>Convert to UTCS-2 BE BOM</MenuItem>
			<MenuItem>Convert to UTCS-2 LE BOM</MenuItem>
		</MenuItemsGroup>
	</Menu>
</Example>
@code {
    void OnReady(Menu menu)
    {
        menu.ItemClicked += delegate(object sender, MenuItemClickedEventArgs args)
        {
            Console.WriteLine(args.Label);
        };
    }
    void OnItemClick(Event eventObj)
    {
        MenuItemClickEventDetail detail = eventObj["Detail"];
        Console.WriteLine(detail.Label);
    }
}

Best regards,
Peter Stoev
Smart UI Team
https://www.htmlelements.com/