See the Error assigned not visible Action to TdxBarButton ticket.
Documentation - Code examples mention the TdxBarButton.Create constructor in the "How to Add Custom Items to a Toolbar's Popup Menu" topic
Answers approved by DevExpress Support
We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.
Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.
- v19.2.4Download Official Update
- v19.1.9Download Official Update