Using Our Data Type
![generated description: usingdatatype 20111](images/tweb_usingdatatype_20111.png)
Once we have created (and compiled) our Duration class, we can return to the Film class and add a new property named Length (again using the Add New Property wizard within the Class menu). It's datatype is Cinema.DurationOpens in a new tab, the class we just created. We simply select it from the Type list, just as we would a built-in data type.