[brd]

А где можно взяглянуть на док. по вашему коду:

    
        page.10 = FORM_INT
        page.10 {
        
                prefix = tx_form
                confirmation = 1
                postProcessor {
                    1 = mail
                    1 {
                        recipientEmail = 43
                        senderEmail = 43
                        subject = 43
                    }
                }
                10 = TEXTLINE
                10 {
                    name = gregre
                    label.value = Edit this label
                }
                20 = SELECT
                20 {
                    name = 3
                    label.value = Edit this label
                    
                    10 = TEXT
                    10.value = <option>1</option>
                    
                    20 = OPTION
                    20.data = Option 1
                    
                    30 = OPTION
                    30.data = Option 2
                    
                    40 = OPTION
                    40.data = Option 3
                    40.selected = selected
                    
                }
                30 = SUBMIT
                30 {
                    name = 4
                    value = Submit form
                }
                rules {
                    1 = required
                    1 {
                        breakOnError = 0
                        showMessage = 1
                        message = Required
                        error = This field is required
                        element = 3
                    }
                }

          
          }

Это какой то плагин?