This tutorial continues building on the Custom Command by adding the ability to watch the project and automatically perform any task as the project changes. In this case, when the number of tracks change, the track count will automatically adjust to reflect the new counts.
To look at the changes, we watch VEGAS for TrackCountChanged. This is one of several things that can be watched by the extension. You can download this full code for this Custom Command here: http://www.jetdv.com/tutorial/Vegas/CCTestAfterUndo.zip
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