I cannot display the controls in design mode

[Javier]

Hi guys!
I´m experiment problems to visualization of controls in my WPF project. Actually I'm working with Visual Studio 2017, but only appear a black screen.
I Attach a picture

[Vladimir Stoyanov]

Hello Javier,

Thank you for the provided picture. 

If the controls are displayed as intended when running the application, it is possible that Visual Studio has cached an older version of the dlls. You can try removing the Telerik references and readding them while making sure that all references point to the same directory, are of the same version and are either Xaml or NoXaml. Then you can delete the bin and obj folders and perform a clean and rebuild on the solution. 

If the above suggestion proves unhelpful, you can share a sample project demonstrating the scenario in a new support ticket (since project files cannot be attached to forum posts). This will allow us to investigate and further assist you. 

Regards,
Vladimir Stoyanov
Progress Telerik