From the CHANGES.TXT file in the vegaspro8scriptsdk:

VEGAS PRO 8.0a:
* Fixed problem with docking more than one managed dock window in the
same parent frame. Previously, Vegas would show the first managed
dock window window in the tab order even when another window was
selected. Managed dock windows now are assigned unique window ids
when they are created. There is a limit of 100 managed dock windows
visible at the same time.

* Added new event, Vegas::TrackEventTimeChanged, which occurs when
TrackEvents change position or size.

* Fixed problem with changing the Selected property of TrackEvent
objects. Now the main track view's selection list is updated with
changes made by a script or extension.

* Fixed problem with the InsertTime method of the Project class which
caused it to ignore prior changes to the set of selected events.
Also added a new version of the InsertTime method with a boolean
argument, ignoreSelection, which allows you to ignore the current
event selections and insert time into all trackso.

* Classes that implement the ICustomCommandModule interface can now be
declared in any namespace. Previously, due to a bug, Vegas would
only create them if they were declared in the root level (global)
namespace.