Thank you for writing back.
It appears that the missing values in the drop-down are caused by a limitation of the designer in Visual Studio. RadGanttView
will be working with two tables coming from the data source, and the designer cannot decide which fields to populate for each of the drop-downs.
In order to achieve your task simply put the columns names in the editors. Since you are working with the database as per our documentation article, please make sure that you put the same fields as described here
I hope this helps. Should you have further questions please do not hesitate to write back.
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