It really is [Viewable]. Omitting the setter will be another way, which makes sense in this scenario.
I assume that you have a real problem - this is an old copy of this control stored in the toolbox build folder. Such a copy is created if you add the control to the toolbar yourself using the "Select Items", "Browse" items. You may be updating your local copy, but not the toolbar version.
I need to wave my arms a little, I know that this can happen, but it was not discovered how this happens. This never went wrong for me personally, but I always make sure that the toolbar automatically fills itself, and does not add the control explicitly. If you added it like this, then start by deleting it. Right-click an item in the toolbar and select Delete. A copy is stored in c: \ users \ yourname \ appdata \ local \ microsoft \ visualstudio \ xx \ projectassemblies
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