This example demonstrates different copy/paste scenarios supported by RadGridView. You can configure ClipboardCopyMode and ClipboardPasteMode through a ContextMenu displayed on right click over the control.
There are also various additional options to be configured on the most right side of the window.
See also:
http://docs.telerik.com/devtools/wpf/controls/radgridview/clipboard/copying.html
http://docs.telerik.com/devtools/wpf/controls/radgridview/clipboard/pasting.html
