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Adding a separator bar between two menu items allows you to group items on the control:
To add a separator bar to a C1ContextMenu control, place <c1:C1Separator /> between two <c1:C1MenuItem> tags. The result will resemble the following:
<c1:C1MenuItem Header="File" />
<c1:C1Separator/>
<c1:C1MenuItem Header="Options" />