wpf 菜单

<Style TargetType="{x:Type DataGrid}">
	<Setter Property="ContextMenu">
            <Setter.Value>
                <ContextMenu  StaysOpen="true">
                    <MenuItem Header="Copy" Command="{x:Static ApplicationCommands.Copy}">
                    </MenuItem>
                </ContextMenu>
            </Setter.Value>
    </Setter>
</Style>