Why elements doesn't show in column?

Hi all!

I have unburied a script from old days of Acrobat 8. It have a custom GUI, with elements that shows in rows forming groups, and all the groups in a column.
But now, in Acrobat XI, all of them are showed in a single row of 3 screens wide.
Here's the GUI's code (I have deleted a big portion, the elements are repetitive):

    // descricion de los elementos del GUI
    description: {
        name: 'REPrinter',
        //width: 180,
        //height: 200,
        type: 'cluster',
        align_children: 'align_offscreen',
        elements: 
            [{ type: 'view',
            align_children: 'align_row',
            elements: [
                { type: 'static_text',
                name: 'Combinaciones:',
                bold: true,
                font: 'dialog' },

                { type: 'edit_text',
                item_id: 'ncom',
                SpinEdit: true,
                font: 'dialog',
                char_width: 3,
                height: 20 },

                { type: 'static_text',
                name: '   ' },

                { type: 'check_box',
                item_id: 'tldr',
                name: 'Taladrado' },

                { type: 'static_text',
                name: '   Impresora',
                bold: true,
                font: 'dialog' },

                { type: 'radio',
                item_id: 'prn1',
                group_id: 'prnt',
                name: '1' },

                { type: 'radio',
                item_id: 'prn2',
                group_id: 'prnt',
                name: '2' },
            ] },

            // espacio entre botones y ficheros
            { type: 'gap',
            height: 15 },

            // listado ficheros
            { type: 'view',
            align_children: 'align_row',
            elements: [
                { type: 'static_text',
                name: '    1.-',
                bold: true,
                font: 'dialog' },

                { type: 'edit_text',
                item_id: 'nf01',
                readonly: true,
                font: 'dialog',
                char_width: 30,
                heigth: 20 },

                { type: 'check_box',
                item_id: 'cf01',
                name: 'C '},

                { type: 'check_box',
                item_id: '2f01',
                name: '2'},
            ] },

            { type: 'view',
            align_children: 'align_row',
            elements: [
                { type: 'static_text',
                name: '    2.-',
                bold: true,
                font: 'dialog' },

                { type: 'edit_text',
                item_id: 'nf02',
                readonly: true,
                font: 'dialog',
                char_width: 30,
                heigth: 20 },

                { type: 'check_box',
                item_id: 'cf02',
                name: 'C '},

                { type: 'check_box',
                item_id: '2f02',
                name: '2'},
            ] },

       
        // separacion entre ficheros y botones
        { type: 'gap',
        height: 15 },

        // botones OK y Cancel
        { type: 'ok_cancel',
        ok_name: 'Empezar',
        cancel_name: 'Cancelar' }
    ]}  // fin description

The lines 

//width: 180,
//height: 200,
type: 'cluster',
align_children: 'align_offscreen',

aren't in the original code, I have tried it with not result, like other types and align options.

Can somebody tell me what's wrong and how to fix it?

Thnaks in advance,

Jose