How to create a button menu similar to the Show Receipts menu in ShowJournalView

[RethaLam]

I have a custom view.
On one of the appBar buttons that is added using "let config: Views.ICustomViewControllerConfiguration", I would like for it to open 2 options when the user clicks on the appBar button and then the user must select one of the 2 options that are also buttons. Similar as to how Show Receipts then open 2 menu options where one can select either Show Receipt or Show Gift Receipt.

Is there any GitHub examples that can show me how to use it ? If so, can you please point me in the right direction.
If not, can anybody help me figure out how to do it?

I get as far as :

`let HQFormMenuOptions: Controls.IMenuOptions = {
type: "button",
directionalHint: 0,
commands: [
{
id: 'PackSlipandLabel',
label: 'Packslip and label',
isVisible: true,
canExecute: true

        },
        {
            id: 'ShipLabel',
            label: 'Ship label',
            isVisible: true,
            canExecute: true
        }]

`

I think these menu options need to be linked to a command in the commandBar on:
let config: Views.ICustomViewControllerConfiguration = { title: vTitle, commandBar: { commands: [ ... ]} };
Seeing that the IMenuOptions don't have an "Execute:" like the ICommandDefinition, how do I execute code when the user clicks on any of the 2 menu options?