该功能还存在很多BUG，仅供参考
Ext.net.ResourceMgr.load([{ url: _HOST + "Js/OverwriteExtjs/LockingHeaderGroupView.js"}]);
//rows为Record.data的数组
view = new Ext.ux.grid.LockingHeaderGroupView({ grows: [rows] });
colModel = new Ext.ux.grid.LockingHeaderColumnModel(columns);