Got it to work.  Thanks!

Toggling the docked state should still function. That too wouldn't work right if the elements in the custom PaneToolWindow template didn't use the part names required. If it doesn't work without a custom style but just when setting the UseOsNonClientArea to false then please post a sample and we can look into why it is not working.

I am referring to the docking feature.  When you double click on the header, the window docks back into place.

Dragging of the floating window would still work assuming you are using the element names (i.e. part names) we are using in our template. As to the pinning functionality I'm not sure what you mean - floating elements don't support pinning/unpinning. Only docked panes are unpinnable.

This works, but also removes dragging and pinning functionality.  Do we have to re-implement those features if we set the UseOsNonClientArea property to false?