You could do this:
Framework BRL.Blitz Import BRL.StandardIO Type t1 Field val1:Int Field val2:Int Field val3:Int Function create:t1() Local retval:t1=New t1 retval.val1=5 retval.val2=10 retval.val3=15 Return retval EndFunction EndType Type t2 Method foo(v:t1=Null) If (v=Null) v=t1.Create() Endif bar(v) End Method Method bar(v:t1) DebugLog(v.val1) DebugLog(v.val2) DebugLog(v.val3) EndMethod EndType Type t2ext Extends t2 Method bar(v:t1) Print "Overridden method! - " + v.val1 + " - " + v.val2 + " - " + v.val3 End Method End Type Local meep:t2=New t2 Local baz:t2=New t2ext meep.foo() baz.foo()