Lost Toolbox pin, how to autohide?

[Guest]

I pinned the toolbox window down and moved it around, right clicked and
selected "Tabbed document" and changed it back to "Dockable".
While attempting to move it back to the left side, it did not want to snap
back and dock there. It also lost the pin. It simply "sits" there! Autohide
is greyed out for that window. When I select "auto hide all" it auto hides
all windows except the toolbox!
Went to "How do I" on "Arrange and Dock windows" but that did not help either.

What am I doing wrong?

Thanks for your help,

John

 

[Guest]

right click on toolbox window title bar.