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When using a complex data type in DataGrid in edit mode, the property with this data type is always equal to NULL.
Example:
public class Order
{
public int? OrderID { get; set; }
public string CustomerID { get; set; }
public DateTime? OrderDate { get; set; }
public double? Freight { get; set; }
public string ShipCountry { get; set; }
public Compl MyCompl { get; set; }
public class Compl
{
public string MyProperty2 { get; set; }
}
}
Order.MyCompl - always equal to NULL in edit mode.

I am attaching an example of the project.
Thank you.