>Can I have a class that can modify a textbox class and a spinner class
>at the same time ?
>I want to use a new property or the same method in both classes.
>
>For example:
>
>I want the lostfocus event execute the same thing for both classes, without
>using an external function, and I want to declare a new property that can
>be used in both too.

You can't do exactly what you want because you can't change FoxPro's class hierarchy (BTW, there's no such thing :))).

But you can define a Behavior class. This Behavior must have all common methods. Your classes will have a property that will keep a reference to a Behavior object. All methods for this classes will just call the the corresponding methods of Behavior object.

Advantages:
1. You can have many Behavior classes and change them at runtime. (It's like you would change the class hierarchy at runtime!!);
2. Behavior classes can have also a property that will point to another behavior object. This is extremly good because you can chain Behaviors.

Disadvantage: You can not do the same thing for properties since there is no possibility to call (automatically) a method everytime a property is used (like you can do in Visual C++). And this is a VERY BIG lack of VFP.

Vlad