I just posted a new version 2.0 of both the HierarGrid and the DynamicControlsPlaceholder that works with ASP.NET 2.0. As many of you pointed out, the old versions worked with ASP.NET Beta2 but failed under the final version.
If you run into an error message "The file '/.../<WrongFilename>.ascx' does not exist." in any of the two components please download the newest version and try it again.
Sorry for the late response to this problem but I've been on vacation (South Africa, FWIW) the last 4 weeks. :)
Download here
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