protected override DAItemSource CreateItemSource(DAMappingContext mappingContext,
            DAMemberMappingDefinition memberMappingDefinition)
        {
         var mappingParent = mappingContext.ParentMapping; 
            if (mappingParent != null)
            {
 
                var mappingTarget = (OpcLabs.BaseLib.LiveMapping.ObjectMemberMappingTarget)mappingParent.MappingTarget;
                var t = mappingTarget.MemberInfo.DeclaringType.GenericTypeArguments[0];
 
                /*var t =
                    ((((OpcLabs.BaseLib.LiveMapping.ObjectMemberMappingTarget)
                        (mappingParent.MappingTarget))
                        .MemberInfo).DeclaringType).GenericTypeArguments[0];*/
 
                memberMappingDefinition.ItemAttribute.ItemType = t;
            }
}