The application can trigger edit mode through the Gantt state, similar to the how you can trigger edit mode programmatically in the Grid. However, in this case, the Gantt edit form does not show the tabs for editing dependencies and custom model properties.

Test page with a possible JavaScript-based workaround (it requires the item to edit to be rendered:

https://blazorrepl.telerik.com/cpOKmIuC29Unl2B429