Vertically rotated Label on all subMenuItems inside MenuItem - wpf

Question

I have a Menu in my app, that consists of few MenuItems. I'd like a vertical label on the left side of all the MenuItems. Like this (of course with grey background, pardon my paint skill):
I've tried it this way:
<Menu IsMainMenu="True" Grid.Row="0" Grid.ColumnSpan="3">
<MenuItem Header="_File">
<TextBlock Text="Type1" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="0,0">
<TextBlock.LayoutTransform>
<RotateTransform Angle="-90"/>
</TextBlock.LayoutTransform>
</TextBlock>
<MenuItem Header="_Open" Command="{Binding OpenFileCommand}" IsEnabled="{Binding CanOpenFile}"/>
<Separator/>
<MenuItem Header="_Save" Command="{Binding SaveFileCommand}"/>
<MenuItem Header="_Save As" Command="{Binding SaveAsFileCommand}"/>
<Separator/>
<MenuItem Header="_Exit" Command="{Binding ExitAppCommand}"/>
</MenuItem>
</Menu>
But it produces an output like this:
Then I tried it via background image (transparent with just a plain text):
<Menu IsMainMenu="True" Grid.Row="0" Grid.ColumnSpan="3">
<MenuItem Header="_File">
<MenuItem.Background>
<ImageBrush ImageSource="{Binding SelectedObjectResourcePath}"/>
</MenuItem.Background>
<MenuItem Header="_Open" Command="{Binding OpenFileCommand}" IsEnabled="{Binding CanOpenFile}"/>
<Separator/>
<MenuItem Header="_Save" Command="{Binding SaveFileCommand}"/>
<MenuItem Header="_Save As" Command="{Binding SaveAsFileCommand}"/>
<Separator/>
<MenuItem Header="_Exit" Command="{Binding ExitAppCommand}"/>
</MenuItem>
</Menu>
But it sets the background for the first menuItem only:

Answer 1

Using StackPanel (with horizontal orientation) here is the best solution in my opinion. Check this out. You just need to make it look as good as you want :)
<Menu IsMainMenu="True" Grid.Row="0">
<MenuItem Header="_File">
<StackPanel Orientation="Horizontal">
<Label Content="Type1" Margin="-30" HorizontalContentAlignment="Center">
<Label.LayoutTransform>
<RotateTransform Angle="-90"/>
</Label.LayoutTransform>
</Label>
<StackPanel>
<MenuItem Header="_Open" Command="{Binding OpenFileCommand}" IsEnabled="{Binding CanOpenFile}"/>
<Separator/>
<MenuItem Header="_Save" Command="{Binding SaveFileCommand}"/>
<MenuItem Header="_Save As" Command="{Binding SaveAsFileCommand}"/>
<Separator/>
<MenuItem Header="_Exit" Command="{Binding ExitAppCommand}"/>
</StackPanel>
</StackPanel>
</MenuItem>
</Menu>