When I tried the examples (M$ Gantt) in Whidbey (Beta2) I could not set the DateScalerProperties.StartTime Propery. No error message, but the value always stayed at 5/8/2005?
We had a GTP.NET bug that stopped Start dates larger than stop dates. This is now fixed (Stop date is changed to start date in this case).
I have tried this in VS2005 Beta 2, and it works. Download the latest patch from here: https://plexityhide.com/pub/PlexityHide.GTP.zip