To select all the cells of a sheet we can use kendo.spreadsheet.SHEETREF
. At the moment this is not in the documentation because of how recent the development has been, but be sure that it will be included.
to see it in action check this sample in the Kendo UI Dojo
I hope this helps!
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI