load data in checkboxes group (no handle array)

Hi,
i've some problem with my form in wich is present a checkbox group.
The form is directly connected with CCv5 (i modified a record)

this is my simple form, and this is the debug:

​

Array
(
    [cont] => lists
    [ccname] => corso
    [act] => edit
    [gcb] => 1
    [corso] => Array
        (
            [id] => 1
            [created] => 2018-04-27 16:43:45
            [modified] => 2018-04-28 08:59:42
            [nome] => Master in Hotel Management - Londra
            [categoria] => 3
        )

    [cat_corsi] => Array
        (
            [id] => 3
            [created] => 2018-04-27 16:42:25
            [modified] => 2018-04-27 16:43:13
            [categoria] => Master in aula
        )

    [tipo_corso] => Array
        (
            [0] => Array
                (
                    [id_tipologia] => 1
                )

            [1] => Array
                (
                    [id_tipologia] => 2
                )

            [2] => Array
                (
                    [id_tipologia] => 3
                )

            [3] => Array
                (
                    [id_tipologia] => 4
                )

            [4] => Array
                (
                    [id_tipologia] => 5
                )

            [5] => Array
                (
                    [id_tipologia] => 7
                )

            [6] => Array
                (
                    [id_tipologia] => 8
                )

            [7] => Array
                (
                    [id_tipologia] => 9
                )

        )

    [categoria] => Array
        (
            [0] => Array
                (
                    [id] => 4
                    [created] => 2018-04-27 16:42:48
                    [modified] => 2018-04-27 16:48:43
                    [categoria] => Corsi brevi in aula
                )

            [1] => Array
                (
                    [id] => 3
                    [created] => 2018-04-27 16:42:25
                    [modified] => 2018-04-27 16:43:13
                    [categoria] => Master in aula
                )

            [2] => Array
                (
                    [id] => 5
                    [created] => 2018-04-27 16:43:09
                    [modified] => 2018-04-27 16:43:13
                    [categoria] => Master on-line
                )

        )

    [tipologia] => Array
        (
            [0] => Array
                (
                    [id] => 1
                    [created] => 2018-04-27 18:14:59
                    [modified] => 
                    [nome] => Front/Back Office
                )

            [1] => Array
                (
                    [id] => 2
                    [created] => 2018-04-27 18:15:09
                    [modified] => 
                    [nome] => Amministrazione/Contabilità
                )

            [2] => Array
                (
                    [id] => 3
                    [created] => 2018-04-27 18:15:17
                    [modified] => 
                    [nome] => Booking
                )

            [3] => Array
                (
                    [id] => 4
                    [created] => 2018-04-27 18:15:24
                    [modified] => 
                    [nome] => Sistemi informativi
                )

            [4] => Array
                (
                    [id] => 5
                    [created] => 2018-04-27 18:15:32
                    [modified] => 
                    [nome] => Congressuale/Eventi
                )

            [5] => Array
                (
                    [id] => 6
                    [created] => 2018-04-27 18:15:42
                    [modified] => 
                    [nome] => Revenue
                )

            [6] => Array
                (
                    [id] => 7
                    [created] => 2018-04-27 18:15:50
                    [modified] => 
                    [nome] => Sales&Marketing
                )

            [7] => Array
                (
                    [id] => 8
                    [created] => 2018-04-27 18:15:56
                    [modified] => 
                    [nome] => HR
                )

            [8] => Array
                (
                    [id] => 9
                    [created] => 2018-04-27 18:16:05
                    [modified] => 
                    [nome] => F&B
                )

            [9] => Array
                (
                    [id] => 10
                    [created] => 2018-04-27 18:16:14
                    [modified] => 
                    [nome] => Room Division
                )

        )

)

Array
(
)

How it's possible to populate checkboxes group from "tipo_corso" array?