AS I CAN PUT AN ERROR IN A CELL OF THE XAMDATAGRID SO THAT OR IT ANTICIPATES IN THE DATAERROR OF THE CELL IN WPF
Hello Mario,
It has been a while since you have made your post, in case you still need support I will be glad to assist you further. I suppose the other community members can benefit from this answer as well. So I have been looking through you post and I suggest you see this link from our online documentation:
http://help.infragistics.com/NetAdvantage/WPF/2011.1/CLR4.0/?page=xamDataPresenter_Enable_IDataErrorInfo_Interface_Support.html
where it is described how to enable IDataError Interface support of the XamDataGrid.
Feel free to write me if you have further questions.