this.GetThemeService() not found.

[SunnyWar]

I've been making the SimpleCalc on this page: https://platform.uno/docs/articles/external/workshops/simple-calc/modules/MVUX-CSharp/05-Finish%20the%20App/README.html
When I add the this.GetThemeService() call, the compiler complains that: 'MainPage' does not contain a definition for 'GetThemeService' ...

I tried looking at the sample, which suggests that it can be found in a Nuget package?
Any help is appreciated.

[SunnyWar]

It's possible that in the Wizard I didn't select 5.Theme"Theme Service" and thereby that applicable nuget packages were not added.
I will start over and still if that fixes it.

[SunnyWar]

That did it.