My name is Dimitar Kapitanov and I' am the person who governs the RadDock component development. We are aware of the resize problem when changing from autohide to docked and back and we are working on its solution as we speak. We will try our best to fix it for the upcoming SP release this week.
Regarding the events that fire during pin/unpin or autohide/dock operations, we implemented two more generic events in the DockManager: DockingStateChanged and DockingStateChanging. The later is cancelable for better control.
Do not hesitate to write back in case you need further assistance.