As of VS 2017, the class designer appears to have become an optional component which must be installed separately. This page and others should mention this. (But this was the first page I was brought to by Google!)
Source of information: https://stackoverflow.com/q/42233831/1768779
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@ChrisMaddock thanks so much, i'll update this topic.
This is fixed now. Thanks again!
Thanks!
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@ChrisMaddock thanks so much, i'll update this topic.