Properties Panel Extension: how to add entryFactory.table?

according to this example we may use different form input components from EntryFactory. For my custom properties panel they work fine but now I’m trying to use a EntryFactory#table and nothing happens. There is no any example, could you please help and give any? I tried this: group.entries.push(entryFactory.table({ id : 'newTable', labels: [ 'Name', 'Value'], canBeShown: true, addLabel: 'Add Entry', modelProperties: [ 'key', 'value' ] })); but in properties panel nothing changes, using browser inspector i’ve noted that table added but somehow it had class “bpp-hidden”
Why? And how to add a simple visible table correctly?

Thanks in advance.