(C# WPF)单击menuB中的MenuItem时如何打开menuA

<StackPanel>
    <Menu Name="menuA">
        <MenuItem Header="Option 1"/>
        <MenuItem Header="Option 2"/>
    </Menu>
    <Menu Name="menuB">
        <MenuItem Header="Open menuA" Click="MenuItem_Click"/>
    </Menu>
</StackPanel>

private void MenuItem_Click(object sender, RoutedEventArgs e)
{
    menuA.IsOpen = true;
}