Hi José,
>>
>>>I need to know when the data in a TextBox change.
>>>
>No, Interactive method don´t run, TRY THAT.

>
Your code doesn´t create a program./interactivechange for your textbox control !

It creates those methods for the form instead of the textbox.. This is the reason that all the deal is not working.. Try something as:

PUBLIC otabform1

SET CLASSLIB TO f:\d\ds\comun\cls\tabclass.vcx ADDITIVE

CREATE TABLE TITAS26 (ctitas c(2), titas c(40))
INSERT INTO TITAS26 (CTITAS, TITAS) VALUES ("c1","DESC C1")
INSERT INTO TITAS26 (CTITAS, TITAS) VALUES ("c2","DESC C2")
INSERT INTO TITAS26 (CTITAS, TITAS) VALUES ("c3","DESC C3")
GO TOP

otabform1=NEWOBJECT("tabform1")
otabform1.Show

RETURN
**************************************************
*-- Form:         tabform1 (c:\form1.scx)
*-- ParentClass:
*-- BaseClass:    form
*-- Marca de hora:   02/26/03 05:11:14 PM
*
DEFINE CLASS tabform1 AS form
	DoCreate = .T.
	Name = "Tabform1"
	ADD OBJECT txtctitas AS textboxX WITH ;
		ControlSource = "titas26.ctitas", ;
		Height = 23, ;
		Left = 213, ;
		MaxLength = 2, ;
		TabIndex = 2, ;
		Top = 99, ;
		Width = 38, ;
		Name = "txtCtitas"
	ADD OBJECT txttitas AS textboxX WITH ;
		ControlSource = "titas26.titas", ;
		Height = 23, ;
		Left = 211, ;
		MaxLength = 40, ;
		TabIndex = 4, ;
		Top = 140, ;
		Width = 288, ;
		Name = "txtTitas"
ENDDEFINE
DEFINE CLASS textboxX AS textbox
		Comment = ""
	PROCEDURE txttitas.ProgrammaticChange
		WAIT WINDOW "HOLA"
	ENDPROC
	PROCEDURE txttitas.InteractiveChange
		WAIT WINDOW "HOLA"
	ENDPROC
	PROCEDURE command1.Click
		SELECT TITAS26
		SKIP
		THISFORM.Refresh()
	ENDPROC
ENDDEFINE

It certainly will solve the problem..

Claudio