After three days I was unable to solve the problem. The problem was solved only when I created a fresh WPF project and migrated all files to the new project. Only then did the event appear in the developer interface.

While solving the problem, I tried several times:

• Clean Solution

• Manually deleted the bin folder

• Rebuilding Solution

All these methods did not allow the event to be displayed in the Visual Studio Event tab.

Image from new WPF project: