Extjs 3.4 reuse same grid in two tabPanel

I have a grid and 2 tabPanel. When i change the tab I reconfigure the colum model and I want to show the reconfigured grid. Is possibile?

Code:

var tabPanel = new Ext.TabPanel(
    {
            renderTo: 'panel',
            activeTab: 0,
            items: [
            {
                    itemId: bt,
                    title:'one',
                    items: grid
            },
            {
                    itemId: mlt
                    title:'two',
            }],
            listeners:
            {
                tabchange: function(panel, tab){

                    tab.itemId == mlt ? grid.reconfigure(grid.getStore(), mltColModel) : grid.reconfigure(grid.getStore(), btColModel);

                }
            }
    });

As you can see there are 2 tab and 1 grid. In the second tab named 'two' I don't use the items property becouse in html a component can be rendered only one time. With this configuration the grid is not shown when I go in the second tab named "two"



Extjs 3.4 reuse same grid in two tabPanel