Hi Scott,
Thank you for your interest in Syncfusion products.
We are able to see the behavior as you said. But this is the behavior of the Microsoft Tab control also, when we add a tab control to a form and then added a tool strip, now setting the dock to fill on the tab control. We can able to see that the tab control covers the tool strip. We couldn’t make the fill only for the tab control.
Please take a look into the video clip for .Net Tab and Toolstrip controls:
http://websamples.syncfusion.com/samples/Tools.Windows/F69934/main.htmPlease let me know if you have any other queries.
Best Regards,
Bhuvana