Hi Paul,
Yes. You can maintain different styling mechanism for different state of dock window using DockStateChanged event. As per the current version, DockingManager have ability to customize the dock window HeaderTemplate, MenuButton and CloseButton template's. Please have a look into the attached sample for more idea. In the attached sample we are maintaining different style's for docked state and floating state of the dock window. Left side dock window have ability for different style. But Right side dock window style is default. Like this you can do with any dockable windows.
Next version of the DockingManager have ability for complete customization such as docking header container style, tab container style, dock window container style, tab caption style and etc. Using this customization support you can create your own visual look and feel of the docking manager like vista glass effect.
Please let me know if you have any questions.
Thanks,
Venugopal.
DockingStyle.zip