ExtJS 3.4 - toolbar and gridpanel within a tabpanel - only scroll the elements in gridpanel, toolbar should be fixed
===

i have a tabpanel with an item which has a border layout. within there is a region 'center' and layout is 'fit'.
this region has a tabpanel with a toolbar and a grid.
i would like to only scroll the elements within the gridpanel and not the whole content of the tabpanel. i can also say i want to fix the scrollbar. here is the code:

**1. region of the tabpanel:**

        },{
                    /*** CENTER ***/
                    title: 'Region of a tabpanel',
                    collapsible: false,
                    region:'center',
                    layout:'fit',
                    items:[
                        new Ext.TabPanel({
                            activeTab: 0,
                            plain:false,
                            deferredRender : false,
                            id: 'caltabs',
                            cls: 'caltabs',
                            defaults:{
                                autoScroll:false
                            },
                            items:[
                            {
                                    title: '<?php echo __('Zeitabschnitte am Tag',true);?>',
                                    id: 'dayPanel',
                                    html: '<div id="timeslice-monitors-tb-div"></div><div id="timeslice-monitors-div"></div>'
                            },
                                    {xtype: '...'}
                            ]
                        })
                    ]

        },{

if autoscroll as defaults is true it works, but only i've said above for the whole tabpanel.

**2. toolbar will be rendered *to timeslice-monitors-tb-div***

        var tsmontb = new Ext.Toolbar({
          renderTo: 'timeslice-monitors-tb-div',
          ...
**3. gridpanel will be rendered to *timeslice-monitors-div***

        var timesliceMonitorGrid = new Ext.grid.GridPanel({
          renderTo: 'timeslice-monitors-grid-div',
          region: 'center',
          border: false,
          autoHeight:true,
          loadMask : true,
          autoScroll: true,
          columns: timesliceMonitorGridColumns,
          viewConfig: {
          forceFit: true,
          autoFill: true,
          ...


can some extjs expert help me?