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Lost with BusinessListBase addnig New item to collection

Hi to anyone who read this Post..........Im really lost !!!!!!!

fo rthe past week im trying to bind a chilLidtBase to one of its parents or it should be EditableRootList, but when ever im binding the dataGridSource to the DataItem of my parent Class and the dataSource AddNew is turned on (True) at runtime im getting this exception i have searched for it but nothing refrences the Csla Framework does anyone know how to over come this problem

 "Exception"

 AddNew cannot be called on the 'SSS.Library.Child' type. This type does not have a public default constructor. You can call AddNew on the 'SSS.Library.Child' type if you handle the AddingNew event and create the appropriate object.

 PLEASE SOMEONE HELP ME


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