Wow. Many things to do to improve the extension. :)
At the moment I'm rewriting some parts to make the DockPanel a real panel so it can be added directly to a layout; and to delegate to the tabPanel plugin the dock method and some other things related to the container. This way it will be easier to make it work with other containers like Accordion writing another plugin.
Then I will test it with a more complex case with grids forms and other widgets to fix problems related.
Finally tab reordering and StateManager support.
PS: for opera selection issue I think I have to shim the tabs with an iframe to fix it.
PPS: a small improvement: changed the way to highlight the drop zone. Now the extension uses a proxy div over the tabStrip.
It would be nice to see the Panels Name in the GhostTab, when dragging over a possible dropZone (until now it just shows a "|"):)
Looks great, thanks for your hard work on this.
Can you dock/undock panels that are not in any tabpanel? by dragging on their titles?
I found a bug.
If you click on dockonly tab and keep pressing, and...when the windows ghost appears you release the click, you can't dock that panel anywhere.
"this.activeGhost has no properties"