Display time for webtest plugin in playback UI window

Question

I have written a Visual Studio (2008) Webtest plugin, and need to display the time it takes to run in the playback ui window.

I've tried:

e.WebTest.BeginTransaction("B2BValidate");

// then call my plugin

e.WebTest.EndTransaction("B2BValidate");

This indeed adds a "B2BValidate" transaction to the playback window, but the "Total Time" column displays as 0.000 sec. What am I missing?

-Matt