关于Ext扩展自定义控件中内部事件的问题


OMSS.MainPanel = Ext.extend(Ext.Panel, {
 ...
 dataList: {},
 detailShow: {},
 ...
 initComponent: function() {
 ...
 this.store =new Ext.data.Store({
           proxy: new Ext.data.HttpProxy({}),
           reader: new Ext.data.JsonReader({}),
           listeners: {
  'load': function(store) {
   //OMSS.MainPanel.prototype.showDetail();                
  }
           }
 });
 ...
 this.dataList.gridPanel =new Ext.grid.GridPanel({
     ...
            listeners: {
                'rowclick': function(grid, rowIndex, e) {
                    //OMSS.MainPanel.prototype.showDetail();
                },
                'keydown': function(e) {
                    if (e.keyCode == Ext.EventObject.DOWN || e.keyCode == Ext.EventObject.UP) {
                        //OMSS.MainPanel.prototype.showDetail();
                    }
                }
            }  
 });
 this.detailShow.panel =new Ext.TabPanel({...}); }, 
 showDetail: function() {
  contentPanel =this.detailShow.panel;
 }
 
});
我想在三个事件中调用showDetail方法。各位DX，谁知道怎么调？