as below,I set "collapsible:true, titleCollapse:true".
when I cilick on tabs,the panel will collapse too,I want to collapse panel only when I click title of tabpanel,how to config?thanks

var tabs = new Ext.TabPanel({
collapsible:true,
titleCollapse:true,
renderTo:'tabs',
resizeTabs:true, // turn on tab resizing
minTabWidth: 115,
tabWidth:135,
enableTabScroll:true,
autoWidth:true,
height:250,
defaults: {autoScroll:true},
activeTab: 0,
items: [{
title: 'Tab 1',
html: 'A simple tab'
},{
title: 'Tab 2',
html: 'Another one'
}]

});