Sencha-touch: toolbar with automatic button height

My problem: how can I create a toolbar with a bottom toolbar with vertical buttons.

Here is my code

var filterActionsButtons = [
            {
                ui : 'confirm',
                text: 'Apply for current view',             
            },
            {               
                ui : 'action',
                text: 'Apply and Save in your profile',
            },
            {
                ui: 'decline',
                text: 'Cancel',
                handler: function () {
                    filterPanel.hide();
                }
            }           
        ];

        var filterPanel =
            new Ext.Panel({
                fullscreen: true,
                modal: true,
                floating: true,
                centered: true,
                //width: Ext.is.Phone ? 260 : 400,
                //height: Ext.is.Phone ? 260 : 400,
                //autoWidth: true,
                layout: 'fit',
                scroll: 'vertical',
                html: '<h2>Agencies</h2>...',
                dockedItems: [
                    {
                        xtype: 'toolbar',
                        dock: 'top',                        
                        title:'Manage your filters',                        
                    },
                    {
                        xtype: 'toolbar',
                        dock: 'bottom',                     
                        layout: {
                            type: 'vbox',                           
                            align: 'strech',                            
                        },
                        height: '100',
                        //height: 'auto', 
                        items: filterActionsButtons,                        
                    }
                ],
            });

This works because I specify height: '100', but I want to specify auto-height or height. When I specify the "auto" property for height, the buttons are small and are aligned to the left, and when I click one, it (the button) is stretched !!!

So, how can I use height: "auto" for a toolbar with buttons with the same width (automatically strech)?