Hi Todd,
You could stop the AutoHiding of panel by setting the AutoHideIntervel property to maximum integer value. I have created a test sample for this requirement. In this sample, I have added a Docked panel and ComboBoxAdv control.
I hope this resolves your requirement. Please take a look at this sample and let me know if you have any questions.
Thanks for your interest in Syncfusion products.
Regards,
Vijay
Test Sample