Hierchical GridView expand button when no subentries

Hello, Marco,  

Please refer to the following Knowledge Base article which demonstrates how to hide the expander if no child rows exist: https://www.telerik.com/support/kb/winforms/gridview/details/hide-expand-collapse-image-in-hierarchical-radgridview
 
I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess
Progress Telerik

exactly what I needed!

Thanks a lot