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According to the sticky on selectionMode, "Multiple" is supposed to make use of selection with the Ctrl & Shift buttions, yet the opposite is true.
http://www.telerik.com/community/forums/silverlight/gridview/obsolete-property-multipleselect-has-been-deleted.aspx
When I set SelectionMode to "Extended", it uses the shift and ctrl for selection, and Multiple auto-selects rows by clicking.
http://www.telerik.com/community/forums/silverlight/gridview/obsolete-property-multipleselect-has-been-deleted.aspx
When I set SelectionMode to "Extended", it uses the shift and ctrl for selection, and Multiple auto-selects rows by clicking.