This seems related to the compile time error, yes. Can you attach your class so that we can take a quick look at what may be causing this.
Just at a first glance, can you make sure you are using the following notation when declaring the TitleControl:
Taking a closer look at the code will probably allow me to be more specific in this, but I believe it is the protected modifier that is missing there. C# sets properties as private by default if you skip a modifier and you generally cannot change the modifier. Make sure that this is set correctly to protected based on the documentation(try deleting it at typing override in VS - then will automatically suggest TitleControl and make sure everything is correct with the access modifiers).
If this compiles successfully Sitefinity will be able to display the new processor, but it seems that right now it is not resolving the type correctly.
I hope this helps!
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