The source code

    /**
     * @class Ext.Toolbar
     * @extends Ext.Container
     * <p>Basic Toolbar class. Although the <tt>{@link Ext.Container#defaultType defaultType}</tt> for Toolbar
     * is <tt>{@link Ext.Button button}</tt>, Toolbar elements (child items for the Toolbar container) may
     * be virtually any type of Component. Toolbar elements can be created explicitly via their constructors,
     * or implicitly via their xtypes, and can be <tt>{@link #add}</tt>ed dynamically.</p>
     * <p>Some items have shortcut strings for creation:</p>
     * <pre>
    <u>Shortcut</u>  <u>xtype</u>          <u>Class</u>                  <u>Description</u>
    '->'      'tbfill'       {@link Ext.Toolbar.Fill}       begin using the right-justified button container
    '-'       'tbseparator'  {@link Ext.Toolbar.Separator}  add a vertical separator bar between toolbar items
    ' '       'tbspacer'     {@link Ext.Toolbar.Spacer}     add horiztonal space between elements
     * </pre>
     *
     * Example usage of various elements:
     * <pre><code>
    var tb = new Ext.Toolbar({
        renderTo: document.body,
        width: 600,
        height: 100,
        items: [
            {
                // xtype: 'button', // default for Toolbars, same as 'tbbutton'
                text: 'Button'
            },
            {
                xtype: 'splitbutton', // same as 'tbsplitbutton'
                text: 'Split Button'
            },
            // begin using the right-justified button container
            '->', // same as {xtype: 'tbfill'}, // Ext.Toolbar.Fill
            {
                xtype: 'textfield',
                name: 'field1',
                emptyText: 'enter search term'
            },
            // add a vertical separator bar between toolbar items
            '-', // same as {xtype: 'tbseparator'} to create Ext.Toolbar.Separator
            'text 1', // same as {xtype: 'tbtext', text: 'text1'} to create Ext.Toolbar.TextItem
            {xtype: 'tbspacer'},// same as ' ' to create Ext.Toolbar.Spacer
            'text 2',
            {xtype: 'tbspacer', width: 50}, // add a 50px space
            'text 3'
        ]
    });
     * </code></pre>
     * Example adding a ComboBox within a menu of a button:
     * <pre><code>
    // ComboBox creation
    var combo = new Ext.form.ComboBox({
        store: new Ext.data.ArrayStore({
            autoDestroy: true,
            fields: ['initials', 'fullname'],
            data : [
                ['FF', 'Fred Flintstone'],
                ['BR', 'Barney Rubble']
            ]
        }),
        displayField: 'fullname',
        typeAhead: true,
        mode: 'local',
        forceSelection: true,
        triggerAction: 'all',
        emptyText: 'Select a name...',
        selectOnFocus: true,
        width: 135,
        getListParent: function() {
            return this.el.up('.x-menu');
        },
        iconCls: 'no-icon' //use iconCls if placing within menu to shift to right side of menu
    });

    // put ComboBox in a Menu
    var menu = new Ext.menu.Menu({
        id: 'mainMenu',
        items: [
            combo // A Field in a Menu
        ]
    });

    // add a Button with the menu
    tb.add({
            text:'Button w/ Menu',
            menu: menu  // assign menu by instance
        });
    tb.doLayout();
     * </code></pre>
     * @constructor
     * Creates a new Toolbar
     * @param {Object/Array} config A config object or an array of buttons to <tt>{@link #add}</tt>
     * @xtype toolbar
     */
    Ext.Toolbar = function(config){
        if(Ext.isArray(config)){
            config = {items: config, layout: 'toolbar'};
        } else {
            config = Ext.apply({
                layout: 'toolbar'
            }, config);
            if(config.buttons) {
                config.items = config.buttons;
            }
        }
        Ext.Toolbar.superclass.constructor.call(this, config);
    };

    (function(){

    var T = Ext.Toolbar;

    Ext.extend(T, Ext.Container, {

        defaultType: 'button',

        /**
         * @cfg {String/Object} layout
         * This class assigns a default layout (<code>layout:'<b>toolbar</b>'</code>).
         * Developers <i>may</i> override this configuration option if another layout
         * is required (the constructor must be passed a configuration object in this
         * case instead of an array).
         * See {@link Ext.Container#layout} for additional information.
         */

        enableOverflow : false,

        /**
         * @cfg {Boolean} enableOverflow
         * Defaults to false. Configure <tt>true</tt> to make the toolbar provide a button
         * which activates a dropdown Menu to show items which overflow the Toolbar's width.
         */
        /**
         * @cfg {String} buttonAlign
         * <p>The default position at which to align child items. Defaults to <code>"left"</code></p>
         * <p>May be specified as <code>"center"</code> to cause items added before a Fill (A <code>"->"</code>) item
         * to be centered in the Toolbar. Items added after a Fill are still right-aligned.</p>
         * <p>Specify as <code>"right"</code> to right align all child items.</p>
         */

        trackMenus : true,
        internalDefaults: {removeMode: 'container', hideParent: true},
        toolbarCls: 'x-toolbar',

        initComponent : function(){
            T.superclass.initComponent.call(this);

            /**
             * @event overflowchange
             * Fires after the overflow state has changed.
             * @param {Object} c The Container
             * @param {Boolean} lastOverflow overflow state
             */
            this.addEvents('overflowchange');
        },

        // private
        onRender : function(ct, position){
            if(!this.el){
                if(!this.autoCreate){
                    this.autoCreate = {
                        cls: this.toolbarCls + ' x-small-editor'
                    };
                }
                this.el = ct.createChild(Ext.apply({ id: this.id },this.autoCreate), position);
                Ext.Toolbar.superclass.onRender.apply(this, arguments);
            }
        },

        /**
         * <p>Adds element(s) to the toolbar -- this function takes a variable number of
         * arguments of mixed type and adds them to the toolbar.</p>
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {Mixed} arg1 The following types of arguments are all valid:<br />
         * <ul>
         * <li>{@link Ext.Button} config: A valid button config object (equivalent to {@link #addButton})</li>
         * <li>HtmlElement: Any standard HTML element (equivalent to {@link #addElement})</li>
         * <li>Field: Any form field (equivalent to {@link #addField})</li>
         * <li>Item: Any subclass of {@link Ext.Toolbar.Item} (equivalent to {@link #addItem})</li>
         * <li>String: Any generic string (gets wrapped in a {@link Ext.Toolbar.TextItem}, equivalent to {@link #addText}).
         * Note that there are a few special strings that are treated differently as explained next.</li>
         * <li>'-': Creates a separator element (equivalent to {@link #addSeparator})</li>
         * <li>' ': Creates a spacer element (equivalent to {@link #addSpacer})</li>
         * <li>'->': Creates a fill element (equivalent to {@link #addFill})</li>
         * </ul>
         * @param {Mixed} arg2
         * @param {Mixed} etc.
         * @method add
         */

        // private
        lookupComponent : function(c){
            if(Ext.isString(c)){
                if(c == '-'){
                    c = new T.Separator();
                }else if(c == ' '){
                    c = new T.Spacer();
                }else if(c == '->'){
                    c = new T.Fill();
                }else{
                    c = new T.TextItem(c);
                }
                this.applyDefaults(c);
            }else{
                if(c.isFormField || c.render){ // some kind of form field, some kind of Toolbar.Item
                    c = this.createComponent(c);
                }else if(c.tag){ // DomHelper spec
                    c = new T.Item({autoEl: c});
                }else if(c.tagName){ // element
                    c = new T.Item({el:c});
                }else if(Ext.isObject(c)){ // must be button config?
                    c = c.xtype ? this.createComponent(c) : this.constructButton(c);
                }
            }
            return c;
        },

        // private
        applyDefaults : function(c){
            if(!Ext.isString(c)){
                c = Ext.Toolbar.superclass.applyDefaults.call(this, c);
                var d = this.internalDefaults;
                if(c.events){
                    Ext.applyIf(c.initialConfig, d);
                    Ext.apply(c, d);
                }else{
                    Ext.applyIf(c, d);
                }
            }
            return c;
        },

        /**
         * Adds a separator
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @return {Ext.Toolbar.Item} The separator {@link Ext.Toolbar.Item item}
         */
        addSeparator : function(){
            return this.add(new T.Separator());
        },

        /**
         * Adds a spacer element
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @return {Ext.Toolbar.Spacer} The spacer item
         */
        addSpacer : function(){
            return this.add(new T.Spacer());
        },

        /**
         * Forces subsequent additions into the float:right toolbar
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         */
        addFill : function(){
            this.add(new T.Fill());
        },

        /**
         * Adds any standard HTML element to the toolbar
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {Mixed} el The element or id of the element to add
         * @return {Ext.Toolbar.Item} The element's item
         */
        addElement : function(el){
            return this.addItem(new T.Item({el:el}));
        },

        /**
         * Adds any Toolbar.Item or subclass
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {Ext.Toolbar.Item} item
         * @return {Ext.Toolbar.Item} The item
         */
        addItem : function(item){
            return this.add.apply(this, arguments);
        },

        /**
         * Adds a button (or buttons). See {@link Ext.Button} for more info on the config.
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {Object/Array} config A button config or array of configs
         * @return {Ext.Button/Array}
         */
        addButton : function(config){
            if(Ext.isArray(config)){
                var buttons = [];
                for(var i = 0, len = config.length; i < len; i++) {
                    buttons.push(this.addButton(config[i]));
                }
                return buttons;
            }
            return this.add(this.constructButton(config));
        },

        /**
         * Adds text to the toolbar
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {String} text The text to add
         * @return {Ext.Toolbar.Item} The element's item
         */
        addText : function(text){
            return this.addItem(new T.TextItem(text));
        },

        /**
         * Adds a new element to the toolbar from the passed {@link Ext.DomHelper} config
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {Object} config
         * @return {Ext.Toolbar.Item} The element's item
         */
        addDom : function(config){
            return this.add(new T.Item({autoEl: config}));
        },

        /**
         * Adds a dynamically rendered Ext.form field (TextField, ComboBox, etc). Note: the field should not have
         * been rendered yet. For a field that has already been rendered, use {@link #addElement}.
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {Ext.form.Field} field
         * @return {Ext.Toolbar.Item}
         */
        addField : function(field){
            return this.add(field);
        },

        /**
         * Inserts any {@link Ext.Toolbar.Item}/{@link Ext.Button} at the specified index.
         * <br><p><b>Note</b>: See the notes within {@link Ext.Container#add}.</p>
         * @param {Number} index The index where the item is to be inserted
         * @param {Object/Ext.Toolbar.Item/Ext.Button/Array} item The button, or button config object to be
         * inserted, or an array of buttons/configs.
         * @return {Ext.Button/Item}
         */
        insertButton : function(index, item){
            if(Ext.isArray(item)){
                var buttons = [];
                for(var i = 0, len = item.length; i < len; i++) {
                   buttons.push(this.insertButton(index + i, item[i]));
                }
                return buttons;
            }
            return Ext.Toolbar.superclass.insert.call(this, index, item);
        },

        // private
        trackMenu : function(item, remove){
            if(this.trackMenus && item.menu){
                var method = remove ? 'mun' : 'mon';
                this[method](item, 'menutriggerover', this.onButtonTriggerOver, this);
                this[method](item, 'menushow', this.onButtonMenuShow, this);
                this[method](item, 'menuhide', this.onButtonMenuHide, this);
            }
        },

        // private
        constructButton : function(item){
            var b = item.events ? item : this.createComponent(item, item.split ? 'splitbutton' : this.defaultType);
            return b;
        },

        // private
        onAdd : function(c){
            Ext.Toolbar.superclass.onAdd.call(this);
            this.trackMenu(c);
            if(this.disabled){
                c.disable();
            }
        },

        // private
        onRemove : function(c){
            Ext.Toolbar.superclass.onRemove.call(this);
            if (c == this.activeMenuBtn) {
                delete this.activeMenuBtn;
            }
            this.trackMenu(c, true);
        },

        // private
        onDisable : function(){
            this.items.each(function(item){
                 if(item.disable){
                     item.disable();
                 }
            });
        },

        // private
        onEnable : function(){
            this.items.each(function(item){
                 if(item.enable){
                     item.enable();
                 }
            });
        },

        // private
        onButtonTriggerOver : function(btn){
            if(this.activeMenuBtn && this.activeMenuBtn != btn){
                this.activeMenuBtn.hideMenu();
                btn.showMenu();
                this.activeMenuBtn = btn;
            }
        },

        // private
        onButtonMenuShow : function(btn){
            this.activeMenuBtn = btn;
        },

        // private
        onButtonMenuHide : function(btn){
            delete this.activeMenuBtn;
        }
    });
    Ext.reg('toolbar', Ext.Toolbar);

    /**
     * @class Ext.Toolbar.Item
     * @extends Ext.BoxComponent
     * The base class that other non-interacting Toolbar Item classes should extend in order to
     * get some basic common toolbar item functionality.
     * @constructor
     * Creates a new Item
     * @param {HTMLElement} el
     * @xtype tbitem
     */
    T.Item = Ext.extend(Ext.BoxComponent, {
        hideParent: true, //  Hiding a Toolbar.Item hides its containing TD
        enable:Ext.emptyFn,
        disable:Ext.emptyFn,
        focus:Ext.emptyFn
        /**
         * @cfg {String} overflowText Text to be used for the menu if the item is overflowed.
         */
    });
    Ext.reg('tbitem', T.Item);

    /**
     * @class Ext.Toolbar.Separator
     * @extends Ext.Toolbar.Item
     * A simple class that adds a vertical separator bar between toolbar items
     * (css class:<tt>'xtb-sep'</tt>). Example usage:
     * <pre><code>
    new Ext.Panel({
        tbar : [
            'Item 1',
            {xtype: 'tbseparator'}, // or '-'
            'Item 2'
        ]
    });
    </code></pre>
     * @constructor
     * Creates a new Separator
     * @xtype tbseparator
     */
    T.Separator = Ext.extend(T.Item, {
        onRender : function(ct, position){
            this.el = ct.createChild({tag:'span', cls:'xtb-sep'}, position);
        }
    });
    Ext.reg('tbseparator', T.Separator);

    /**
     * @class Ext.Toolbar.Spacer
     * @extends Ext.Toolbar.Item
     * A simple element that adds extra horizontal space between items in a toolbar.
     * By default a 2px wide space is added via css specification:<pre><code>
    .x-toolbar .xtb-spacer {
        width:2px;
    }
     * </code></pre>
     * <p>Example usage:</p>
     * <pre><code>
    new Ext.Panel({
        tbar : [
            'Item 1',
            {xtype: 'tbspacer'}, // or ' '
            'Item 2',
            // space width is also configurable via javascript
            {xtype: 'tbspacer', width: 50}, // add a 50px space
            'Item 3'
        ]
    });
    </code></pre>
     * @constructor
     * Creates a new Spacer
     * @xtype tbspacer
     */
    T.Spacer = Ext.extend(T.Item, {
        /**
         * @cfg {Number} width
         * The width of the spacer in pixels (defaults to 2px via css style <tt>.x-toolbar .xtb-spacer</tt>).
         */

        onRender : function(ct, position){
            this.el = ct.createChild({tag:'div', cls:'xtb-spacer', style: this.width?'width:'+this.width+'px':''}, position);
        }
    });
    Ext.reg('tbspacer', T.Spacer);

    /**
     * @class Ext.Toolbar.Fill
     * @extends Ext.Toolbar.Spacer
     * A non-rendering placeholder item which instructs the Toolbar's Layout to begin using
     * the right-justified button container.
     * <pre><code>
    new Ext.Panel({
        tbar : [
            'Item 1',
            {xtype: 'tbfill'}, // or '->'
            'Item 2'
        ]
    });
    </code></pre>
     * @constructor
     * Creates a new Fill
     * @xtype tbfill
     */
    T.Fill = Ext.extend(T.Item, {
        // private
        render : Ext.emptyFn,
        isFill : true
    });
    Ext.reg('tbfill', T.Fill);

    /**
     * @class Ext.Toolbar.TextItem
     * @extends Ext.Toolbar.Item
     * A simple class that renders text directly into a toolbar
     * (with css class:<tt>'xtb-text'</tt>). Example usage:
     * <pre><code>
    new Ext.Panel({
        tbar : [
            {xtype: 'tbtext', text: 'Item 1'} // or simply 'Item 1'
        ]
    });
    </code></pre>
     * @constructor
     * Creates a new TextItem
     * @param {String/Object} text A text string, or a config object containing a <tt>text</tt> property
     * @xtype tbtext
     */
    T.TextItem = Ext.extend(T.Item, {
        /**
         * @cfg {String} text The text to be used as innerHTML (html tags are accepted)
         */

        constructor: function(config){
            T.TextItem.superclass.constructor.call(this, Ext.isString(config) ? {text: config} : config);
        },

        // private
        onRender : function(ct, position) {
            this.autoEl = {cls: 'xtb-text', html: this.text || ''};
            T.TextItem.superclass.onRender.call(this, ct, position);
        },

        /**
         * Updates this item's text, setting the text to be used as innerHTML.
         * @param {String} t The text to display (html accepted).
         */
        setText : function(t) {
            if(this.rendered){
                this.el.update(t);
            }else{
                this.text = t;
            }
        }
    });
    Ext.reg('tbtext', T.TextItem);

    // backwards compat
    T.Button = Ext.extend(Ext.Button, {});
    T.SplitButton = Ext.extend(Ext.SplitButton, {});
    Ext.reg('tbbutton', T.Button);
    Ext.reg('tbsplit', T.SplitButton);

    })();