Get the edit field for which a context menu was opened

I have a MATLAB UI that I am using the App Designer to use. On the UI, I have multiple Edit Fields, all of which I want to have the same Context Menu. However, when the Context Menu option is selected, I need to know which Edit Field was selected. How do I get which field was right clicked on?

I have tried just using the event source, but that returns the Context Menu object, not the Edit Field that was clicked on

% Menu selected function: AddChannelMenu
function AddChannelMenuSelected(app, event)
    field_num = str2double(event.Source.Tag);
    add_channel(app,field_num);
end

[Mario Malic]

There was a question, I think it was identical one, but the solution wasn't really user friendly. Can you check UIFigure's property of your app, SelectedObject, it might return the Edit Field component.

[Cris LaPierre]

You can find the post Mario may be referring to here.

[Cole Pratt]

The UIFigure doesn't appear to have a SelectedObject property, so I don't think your suggestion will work Mario. As for the previous posting, I wasn't able to get anywhere with it because there is no ClickedOn callback for EditFields.

[Mario Malic]

Then Cris' comment will help you.