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Yes I did it as you said and I see these members in Television.cs, but I don't see the controls in design mode.

You didn't add this code directly, you used designer which added it (between other things) to InitializeComponents, right? I mean something need to be done to synchronize between designer view and C# code, I think those are resx files. May be I'm wrong and it's something on my computer, let's see what other people say.