extjs实现左侧tab

layout  =   new  Ext.BorderLayout(document.body,  ... {

                            center: ...{
                                titlebar: false,
                                tabPosition: 'left'
                            }

                        } );

                        layout.beginUpdate();
                        
                        var iframe  =  Ext.DomHelper.append( document.body, 
                             ... {tag: 'iframe', frameBorder: 0, src: 'BusiLineView.html' } );
            
                        layout.add(  ' center ' ,  new  Ext.ContentPanel( iframe,  ... {title: '公司', fitToFrame:true, closable: false} ));
                        layout.add( ' center ' ,  new  Ext.ContentPanel( ' panel-bk ' ,  ... {title: '板块', closable: false} ));
                        layout.add( ' center ' ,  new  Ext.ContentPanel( ' panel-fund ' ,  ... {title: '基金', closable: false} ));
                        layout.getRegion( ' center ' ).showPanel( 0 );
                        layout.endUpdate();