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            this.activeTab = item;
            if(item){
                var el = this.getTabEl(item);
                Ext.fly(el).addClass('x-tab-strip-active');
                this.stack.add(item);

                this.layout.setActiveItem(item);
                // Need to do this here, since setting the active tab slightly changes the size
                this.delegateUpdates();
                if(this.scrolling){
                    this.scrollToTab(item, this.animScroll);
                }
            }
            this.fireEvent('tabchange', this, item);
        }
    },

<span id='Ext-TabPanel-method-getActiveTab'>    /**
</span>     * Returns the Component which is the currently active tab. &lt;b&gt;Note that before the TabPanel
     * first activates a child Component, this method will return whatever was configured in the
     * {@link #activeTab} config option.&lt;/b&gt;
     * @return {BoxComponent} The currently active child Component if one &lt;i&gt;is&lt;/i&gt; active, or the {@link #activeTab} config value.
     */
    getActiveTab : function(){
        return this.activeTab || null;
    },

<span id='Ext-TabPanel-method-getItem'>    /**
</span>     * Gets the specified tab by id.
     * @param {String} id The tab id
     * @return {Panel} The tab
     */
    getItem : function(item){
        return this.getComponent(item);
    },

<span id='Ext-TabPanel-method-autoScrollTabs'>    // private
</span>    autoScrollTabs : function(){
        this.pos = this.tabPosition=='bottom' ? this.footer : this.header;
        var count = this.items.length,
            ow = this.pos.dom.offsetWidth,
            tw = this.pos.dom.clientWidth,
            wrap = this.stripWrap,
            wd = wrap.dom,
            cw = wd.offsetWidth,
            pos = this.getScrollPos(),
            l = this.edge.getOffsetsTo(this.stripWrap)[0] + pos;

        if(!this.enableTabScroll || cw &lt; 20){ // 20 to prevent display:none issues
            return;
        }
        if(count == 0 || l &lt;= tw){
            // ensure the width is set if there's no tabs
            wd.scrollLeft = 0;
            wrap.setWidth(tw);
            if(this.scrolling){
                this.scrolling = false;
                this.pos.removeClass('x-tab-scrolling');
                this.scrollLeft.hide();
                this.scrollRight.hide();
                // See here: http://extjs.com/forum/showthread.php?t=49308&amp;highlight=isSafari
                if(Ext.isAir || Ext.isWebKit){
                    wd.style.marginLeft = '';
                    wd.style.marginRight = '';
                }
            }
        }else{
            if(!this.scrolling){
                this.pos.addClass('x-tab-scrolling');
                // See here: http://extjs.com/forum/showthread.php?t=49308&amp;highlight=isSafari
                if(Ext.isAir || Ext.isWebKit){
                    wd.style.marginLeft = '18px';
                    wd.style.marginRight = '18px';
                }
            }
            tw -= wrap.getMargins('lr');
            wrap.setWidth(tw &gt; 20 ? tw : 20);
            if(!this.scrolling){
                if(!this.scrollLeft){
                    this.createScrollers();
                }else{
                    this.scrollLeft.show();
                    this.scrollRight.show();
                }
            }
            this.scrolling = true;
            if(pos &gt; (l-tw)){ // ensure it stays within bounds
                wd.scrollLeft = l-tw;
            }else{ // otherwise, make sure the active tab is still visible
                this.scrollToTab(this.activeTab, false);
            }
            this.updateScrollButtons();
        }
    },

<span id='Ext-TabPanel-method-createScrollers'>    // private
</span>    createScrollers : function(){
        this.pos.addClass('x-tab-scrolling-' + this.tabPosition);
        var h = this.stripWrap.dom.offsetHeight;

        // left
        var sl = this.pos.insertFirst({
            cls:'x-tab-scroller-left'
        });
        sl.setHeight(h);
        sl.addClassOnOver('x-tab-scroller-left-over');
        this.leftRepeater = new Ext.util.ClickRepeater(sl, {
            interval : this.scrollRepeatInterval,
            handler: this.onScrollLeft,
            scope: this
        });
        this.scrollLeft = sl;

        // right
        var sr = this.pos.insertFirst({
            cls:'x-tab-scroller-right'
        });
        sr.setHeight(h);
        sr.addClassOnOver('x-tab-scroller-right-over');
        this.rightRepeater = new Ext.util.ClickRepeater(sr, {
            interval : this.scrollRepeatInterval,
            handler: this.onScrollRight,
            scope: this
        });
        this.scrollRight = sr;
    },

<span id='Ext-TabPanel-method-getScrollWidth'>    // private
</span>    getScrollWidth : function(){
        return this.edge.getOffsetsTo(this.stripWrap)[0] + this.getScrollPos();