Hello Wu,

We tested this and the combo looks fine. May I ask you to double check if all the Telerik styles merged in the application are the one that comes from the Fluent theme. I would also recommend you to isolate this in a new project and open a new support ticket from your telerik.com account. This will allow us to test it and investigate what happens.

As a side note, this request was posted in the UI for WPF feedback portal, but it seems as it is related to the Reporting product. If you have further issues or feature request related to Reporting you can post them in the corresponding portal: (https://feedback.telerik.com/Project/162). This way you will get an answer in a faster manner.

Regards,
Martin Ivanov
Technical Support Engineer