Extending dacf controls - Methods definition

Question

I need to extend a dacf control just in order to count the characters the user typed and assign a variable with this value.
When the user types the first character I intercept the keyboard event and assign the variable; OK.
Now I need to assign the initial value wich depends upon the length of the field in the DataBase.
I tryed to fing the method the BC4J uses to assign the initial value to the field in order to redefine it for my purposes, but i didn't find it nor in the documentation nor looking to the class methods.
Does anyone know what's the method used ?
Or better, does anyone know how I can "see" in debugging all methods the system uses in an extended class ?
TIA
Tullio

Answer 1

My problem is a little bit more complex.
I don't need to know "how" I can find the dimension of the field, but "when" the system fills the field (wich method it uses).
In general I need a more precise map of the methods the system uses in order to manage the control, so that I can redefine them.
TIA
Tullio