There seem to be some issues with the latest TIWDBAdvWebGrid. I'm on IW 11.0.36.
Try changing DetailRowShow to any of the the options and try to open the detail rows.
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)
Timestamp: Wed, 20 Apr 2011 04:13:34 UTC
Message: Object doesn't support this property or method
Line: 574
Char: 8
Code: 0
Thanks