Empty row in second one of three bands in UltraGrid

Hello

I have a dataset with a parent, child and grand child buffer. I bound this dataset to an UltraGrid.

At runtime, the second (child) band always has an empty row before the data. It also have this row when there is no child records.

I've dumped the dataset and these empty rows are definitely not in the data.

I cannot figure out where these empty rows come from or how to get rid of them.

Is there anybody who knows what is wrong? Does anybody have any suggestions about what I can try?

Regards

Simon