设置width:1800  出现左右滚动条 时  怎么上下滚动条也出现了 怎么取消  var infoGrid = new Ext.grid.GridPanel({    
          applyTo:'div1',    
            title:"列表",  
  id:"infoGrid",
 width:1800,
 bodyStyle:'width:100%', 
        viewConfig: { 
             forceFit:true 
        },