Cannot visually modify a class based on a nonvisual class (Error 1979)
You have attempted to modify a class that was defined in a program. You must use the Class Designer to modify classes based on base classes or classes defined in .vcx files.
このブラウザーはサポートされなくなりました。
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You have attempted to modify a class that was defined in a program. You must use the Class Designer to modify classes based on base classes or classes defined in .vcx files.