I'm trying to perform operations as illustred in your article here: http://docs.telerik.com/data-access/developers-guide/data-access-model/advanced-model-tasks/developer-guide-domain-model-managing-advanced-project-data-source.
I can't! Object's three in the Data Source tool window seems to be "readonly", not draggable to the RadForm. They have aspect like in the first image attached. If I try to switch to a regular WinForm form, and I come back to the Designer, the aspect of the objects and field is slightly different, as in the second attachment, and I can drag them to the form succesfull.
Where is the trick? Why I can't with the RadForm form?
Thanks in advance.