Extjs gridpanel横向滚动条的问题

viewConfig : {
layout : function() {
if (!this.mainBody) {
return; // not rendered
}
var g = this.grid;
var c = g.getGridEl();
var csize = c.getSize(true);
var vw = csize.width;
if (!g.hideHeaders && (vw < 20 || csize.height < 20)) { // display:
// none?
return;
}
if (g.autoHeight) {
if (this.innerHd) {
this.innerHd.style.width = (vw) + 'px';
}
} else {
this.el.setSize(csize.width, csize.height);
var hdHeight = this.mainHd.getHeight();
var vh = csize.height - (hdHeight);
this.scroller.setSize(vw, vh);
if (this.innerHd) {
this.innerHd.style.width = (vw) + 'px';
}
}
if (this.forceFit) {
if (this.lastViewWidth != vw) {
this.fitColumns(false, false);
this.lastViewWidth = vw;
}
} else {
this.autoExpand();
this.syncHeaderScroll();
}
this.onLayout(vw, vh);
}
}