I use two themes(DXStyle and Office2013DarkGray) and the view just has two DocumentPanels. The problem will show on windows7 but not in windows10. I will show you the steps. The sample demo see attach.
Steps:
1.Start up the application.
2.Click the button of "To Office2013DarkGray".
3.Click the DocumentPanel of “Tab2“.
Problem shows：
I can not see the headers in tab2.
For more details, see the attachment with source code and photos.
We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.
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Hello Jack,
I've reproduced this behavior and forwarded your inquiry to our developers for further research. We will inform you as soon as we have any results.
Thanks,
Andrey