Hi Rafael,
Thanks for using Syncfusion products.
You can remove the empty space by set the grid height as below.
grid.Height = grid.Model.RowHeights.GetDefaultLineSize() * grid.Model.RowCount;
Please download the workaround sample in the below location.
http://www.syncfusion.com/uploads/redirect.aspx?file=SampleProject_5eed151f.zip&team=developmentPlease let me know if you need any more details.
Thanks
Ganesan