Possible error in select field with scroll or renderer

[cmujica2]

-In Sencha touch 1.1
-Tested in Iphone 4, Samsung Galaxy 5, Samsung Galaxy Ace, Google Chrome

SCREEN 1
the first step I choose 1/3 area (EUROPA), then the DESTINY is populated with 3 items , I choose one (the ultimate of list), then VESSEL is populated with 10 items, I chose the ultimate (because I supose the problem is scroll). in this step all is ok
screen1.png

SCREEN 2
the second step is change the combobox AREA, I chose LEJANO ORIENTE, the DESTINY is populated with one item and the device displays empty, if I press "done", the item appears correctly. (in google chrome if I drag to down the item appear). *you know in the smart phone the interface is different to chrome, in the device the item display totally empty, here appear "middle" item*
screen2.png
SCREEN 3
If in the second screen I choose item (pressing "done" in the device or drag down in chrome) the next step is choose VESSEL when the same problem appears.
screen3.png

SCREEN 4
the correct screen
screen4.png
the code

        SL.views.mainDocuments = new Ext.form.FormPanel({
            id: 'mainDocuments',
            items: [
                {
                    xtype: 'fieldset',
                    items: [
                        {
                            xtype: 'selectfield',
                            name: 'selectwad',
                            label: 'Area',
                            store: docAMStore,
                            displayField: 'area',
                            valueField: 'area',
                            listeners: {
                                change: function() {
                                    var fl = SL.views.mainDocuments.getValues();
                                    docDestinyStore.setProxy({
                                        type: 'scripttag',
                                        url:  address+'/documents.aspx?e='+exporter+consignee+'&model=0&t='+type+'&a='+fl.selectwad,
                                        reader: {
                                            type: 'json',
                                            root: 'items'
                                        }
                                    });
                                    SL.views.mainDocuments.items.get(1).items.get(0).enable();
                                    SL.views.mainDocuments.items.get(1).items.get(0).reset();
                                    SL.views.mainDocuments.items.get(2).items.get(0).reset();
                                    SL.views.mainDocuments.items.get(2).items.get(0).disable();
                                    docDestinyStore.load();
                                    SL.views.mainDocuments.items.get(1).items.get(0).setValue('');
                                }
                            }
                        }
                    ]
                },
                {
                    xtype: 'fieldset',
                    items: [
                        {
                            xtype: 'selectfield',
                            name: 'selectdd',
                            label: 'Destiny',
                            store: docDestinyStore,
                            disabled: true,
                            displayField: 'Destiny',
                            valueField: 'Destiny',
                            listeners: {
                                change: function() {
                                    var fl = SL.views.mainDocuments.getValues();
                                    docVesselStore.setProxy({
                                        type: 'scripttag',
                                        url:  address+'/documents.aspx?e='+exporter+consignee+'&model=00&t='+type+'&a='+fl.selectwad+'&d='+fl.selectdd,
                                        reader: {
                                            type: 'json',
                                            root: 'items'
                                        }
                                    });
                                    SL.views.mainDocuments.items.get(2).items.get(0).enable();
                                    SL.views.mainDocuments.items.get(2).items.get(0).reset();
                                    docVesselStore.load();
                                    SL.views.mainDocuments.items.get(2).items.get(0).setValue('');
                                }
                            }
                        }
                    ]
                },
                {
                    xtype: 'fieldset',
                    items: [
                        {
                            xtype: 'selectfield',
                            name: 'selectvd',
                            label: 'Vessel',
                            store: docVesselStore,
                            disabled: true,
                            displayField: 'motonave',
                            valueField: 'motonave'
                        }
                    ]
                },
                {
                    xtype: 'button',
                    text: 'Search',
                    ui: 'confirm',
                    handler: function() {
                        var frm = SLs.views.mainDocuments.getValues();
                        Ext.getBody().mask('Loading...', 'x-mask-loading', false);
                        documentsStore.setProxy({
                            type: 'scripttag',
                            url:  address+'/documents.aspx?e='+exporter+consignee+'&model=000&t='+type+'&a='+frm.selectwad+'&m='+frm.selectvd+'&d='+frm.selectdd,
                            reader: {
                                type: 'json',
                                root: 'items'
                            }
                        });
                        documentsStore.load();
                         SL.views.viewport.setActiveItem(SercoLogistics.views.documentsListContainer,  { type: 'slide', direction: 'left'});
                        SL.views.documentsList.scroller.scrollTo({x:0, y:0});
                        Ext.getBody().unmask();
                    }
                }
            ],
            dockedItems: [
                SL.views.mainDocumentsTopBar,
                SL.views.mainDocumentsBottomBar
            ]
        });

Tips: -The data return by json is correct
-I think that I have scroll problem, but i cant move the SelectField scroll to top
-I added a empty field in the combobox's and I try set this Value but the problem persist
-If I start on the screen 2, the problem does not arise because what happens is that when the combobox is used with many elements above and choose one of the first far then I think that is the scroll down, then when in the same combobox is filled with few elementsof the sample problem or problem scroll painting

Thank you in advance
sorry my english
----
Resumen en español

Amigos mi problema es que tengo 3 combobox los cuales estan enlazados entre si ante un evento de cambio, cuando primero elijo una secuencia en donde los campos son llenados con muchos datos y luego elijo alguno de los finales de la lista (por ejemplo en VESSEL). Luego cuando pruebo otra secuencia (cambiar el primer combobox para que los demas se llenen con otros datos nuevamente) en donde los datos sean mucho menores, pienso que el scroll se queda pegado al final (como en la anterior seleccion) entonces de alguna manera esconde esta nueva seleccion en donde los elementos son 1 o 2, se que el elemento esta ahí pero no lo dibuja bien

[mitchellsimoens]

I'm not sure what the issue is. The images aren't showing.