Similar to the enhancement of the designer functions, you can also define custom object types and register them with List & Label. The new objects are subsequently available to the user in the usual manner through the toolbar on the left and the menu.

Here, a special Collection Editor is also available. You can access it in the development environment with the "..." button of the property DesignerObjects of the previously placed List & Label .NET component. With the "Add" button, you can add a new object type.

See also the provided programmable samples "C# Designer Extension Sample".