Hi,@vbAtom. Could you show me which version of .NET6 you have installed to test?

Hi,@vbAtom. Where are the contents of your app.config in .net6 now? How do you use the app.config file in your project?
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Hi,@vbAtom .Sorry for asking again but I still can't find app.config. Where did you set the app.config? Could you show a screenshot of app.config?

Hi,@MMSunil-2457. Do you want the bubble tooltip to be displayed only in the upper right corner? Is this kind of Baloon tooltip okay?

Hi,@XAMLWPFDeveloper-7560. May I know whether your issue have been solved or not? Do you have time to check my answer? I am glad to help if you have any other questions.

Hi,@ MERUNKUMARMAITY-4120. The above is my complete code, there is no other reference in my project. You could copy and paste it to test.

Hi,@ChaitanyaUtekar-4923. Do you still get this error after restarting Visual Studio? What is your Target Framework?
You could try to switch your TargetFramework to other and then switch back to the TargetFramework you use.
Such as:
- switch to .Net Framework 4.6
- switch back to .Net Framework 4.5.2

Then you can rebuild the solution to see if the problem can be solved.

Hi,@XAMLWPFDeveloper-7560. May I know whether your issue have been solved or not? Do you have time to check my answer? I am glad to help if you have any other questions. 

Hi,@81732665. I tested your code in Visual Studio 2022 and reproduced the error. For the problem that the Visual Studio 2022 designer does not display the window rendering color style, I recommend that you could report a problem in Developer Community.

Hi,@15709958. How are your Template, ContentTemplateSelector and ItemContainerStyle defined and used? Could you show the complete code?

Hi,@HoneyBee-2519. Could you show me the code of your UserControl? If you want to set the parent control through the child control, you may need to use the VisualTreeHelper class.

Hi,@KashishGoyal-4449 .What is the target platform of your project? Can you show your code? Are there any dependencies that are performing the folder creation and then get stuck when the folder is not cleared later in your project?

Hi@AnthonyHarel-0364. Is there any code corresponding to the problem? If so, can you show me your code to analyze? A solution might be to introduce a FonctionViewModel type to bind to each DataGrid row instead of directly binding to your data model type (Fonction). This requires redefining some properties in the view model, which are also in the data model, and introduce the mapping logic from Font to PlantViewModel, and possibly the other way around (if your view is editable), but it will promote the data model Loose coupling between view and view.

Hi,@cedric-6087. I have reproduced your problem and I still need some time to solve it.

Hi,@Anant-3485 .Is the certificate you are using here? I think It may be related to the certificate.

The user in this question did not install the root certificate, it seems that the verification was successful.