For example: To access the name property of the child class:
=First(Fields!child.Value.name,
"iInvoice_Customer")
Or the address2 property of the address class
=First(Fields!address.value.address2,
"iInvoice_Customer")
Or the name property of the object itself
=
" To: " & First(Fields!name.Value, "iInvoice_Customer")
As you can see this customer object contains :
Name - Property
Address - Object
Child - Object