How to add a Separator to a Context Menu in WPF

Separator element in XAML adds a separator to a ContextMenu.

This code snippet creates a ContextMenu with a separator.

<ContextMenu Name="RectangleMenu">
                    <MenuItem Header="Color">
                        <MenuItem Header="Red" Click="RedMenuItem_Click" />
                        <Separator />
                        <MenuItem Header="Green" Click="GreenMenuItem_Click"/>
                        <MenuItem Header="Orange" Click="OrangeMenuItem_Click"/>                       
                    </MenuItem>                   
                </ContextMenu>