转自: http://www.cnblogs.com/exmyth/archive/2013/04/15/3021861.html
bodyStyle :'overflow-x:hidden;overflow-y:scroll', //隐藏水平滚动条,显示用overflow-x:visible
hidden 隐藏 scroll :一定有 auto:自动
通过这个方法可以显示或隐藏滚动条
var form = new Ext.form.FormPanel({
frame : true,
labelWidth : 80,
height : 400,
autoScroll : true,
bodyStyle : 'overflow-x:hidden; overflow-y:scroll',
items : []
})