i can't validate a column in script

i create a dw with this code

string dw_style, ls_sql_syntax, ls_dw_syntax, ls_errors, ls_sql_syntax2, ls_dw_syntax2, v_sql_scr
long nretorno

ls_errors = ""

dw_style = 'style(Type=form) '

ls_sql_syntax = v_sql0
ls_dw_syntax = SyntaxFromSQL( sqlca, ls_sql_syntax, dw_style, ls_errors)

dw_form0.SetReDraw(False)
If LenA(ls_errors) = 0 Then
nretorno = dw_form0.Create (ls_dw_syntax)
If nretorno > 0 Then

else
messagebox("Error en la creación del DataWindow 1" , nretorno)
end if
else
messagebox("Error en la creación del DataWindow 1" , ls_errors)
end if

After that, i wanna change the validation of a column and i use this:

v_error = dw_form0.SetValidate( "nombre" , " trim(gettext())>'' " )

but it doesn't work and this column has no validation and v_error is 1

Can you help me , thanks

Resolved i can't validate a column in script