Hi,
my first steps with a tree grid have all been with JSON data. To define an element that shows up as a parent element with no own parent element (a root element so to say) you have set the value of the ReportsTo to null in your JSON Data example. That works for me as well, when I use JSON data.
I then looked into the csv example, and there was a value (143) assigned to the column ParentEmployeeKey for the persons who showed up as first level elements.
So do any elements with a value for the parentDataField that does not exist in another data set’s keyDataField show up as first level elements, or is there any configuration, that I am not aware of?
Kind regards
Klaus