WPF 制作MenuStrip

<DockPanel x:Name="MenuStrip" Height="30" Opacity="0"  VerticalAlignment="Top" MouseEnter="MenuStrip_MouseEnter"  MouseLeave="DockPanel_MouseLeave">
            <Menu DockPanel.Dock="Top" Height="30" VerticalAlignment="Top">
                <MenuItem Header="用户管理" FontSize="15"  Height="30" Width="72" Click="MenuItem_Click">
                    <MenuItem Header="_New" />
                    <MenuItem Header="_Open" />
                    <MenuItem Header="_Save" />
                    <Separator />
                    <MenuItem Header="_Exit" />
                </MenuItem>
            </Menu>
        </DockPanel>