Cannot get Keyboard Accelerators to work…AT ALL

Question

I've also posted this question to Microsoft's Documentation here.

I am trying to implement both Access Keys and Keyboard Accelerators in a UWP app, which, as I understand it, is "good coding practice". Here is a snippet from MainPage.xaml where I try to implement the "open" shortcut key of "Ctrl+O"

<MenuFlyoutItem Text="Open" AccessKey="O" Click="menuFileOpen">
   <MenuFlyoutItem.KeyboardAccelerators>
        <KeyboardAccelerator Modifiers="Control" Key="O" Invoked="menuFileOpen"/>
   </MenuFlyoutItem.KeyboardAccelerators> 
</MenuFlyoutItem>

Inside MainPage.xaml.cs is the following snippet of code:

    /// <summary>
    /// Menu option to select a file
    /// </summary>
    private void menuFileOpen(object sender, RoutedEventArgs e)
    {
        this.OpenFile();
    }

    /// <summary>
    /// Keyboard Accelerator to select a file
    /// </summary>
    private void menuFileOpen(KeyboardAccelerator sender, KeyboardAcceleratorInvokedEventArgs args)
    {
        this.OpenFile();
        args.Handled = true; // because the docs say to do this
    }

    /// <summary>
    /// Opens the dialog box to select a file.
    /// </summary>
    private void OpenFile()
    {
        // TODO: write the code to open the file
        throw new NotImplementedException();
    }

For debugging purposes, I haven't actually implemented the code to open the file, because of the issue I'm having. All that should happen is, when I select Open from the menu, I should get "NotImplementedException" in the debugger, and the program should stop.

In short, selecting the flyout menu item with a mouse throws the exception. Using access keys also throws the exception. Pressing the Keyboard Accelerator, however, does NOTHING! It doesn't enter the "Invoked" method (the second method signature above), so I can't even place a break point to see if the method gets a hit at all...which I'm pretty certain it doesn't!

What I've tried:

• Renaming the methods to give them unique names
• Adding the "IsEnabled" property, setting it to true, on the KeyboardAccelerator tag in the XAML file.

Any assistance is very much appreciated.