Hi Osten,
Thanks for your interest in Syncfusion products.
You can use the below code and it will work. Try it in button handler.
Here is the code:
grid.Selections.Add(GridRangeInfo.Cells(1,1,2,2));
grid.Focus();
You can also refer the below KB article that discusses the types of selection.
Here is the KB link:
http://www.syncfusion.com/support/kb/grid/Default.aspx?ToDo=view&questId=344Please let me know if it helps.
Regards,
Subhasheela R