Hi Raul,
Thank you for your interest in Syncfusion products.
Please refer the below kb article which deals with how to remove the "+" sign from row having no child in GridDataBoundGrid Treeview.
http://www.syncfusion.com/support/kb/grid/Default.aspx?ToDo=view&questId=330Please let me know if this helps.
Best Regards,
Srirajan