Ext GroupingView展开第一个分组

store.load({
    callback: function(a,b,c){
        var gridView = grid.getView();
        var groupsLength = gridView.getGroups().length;
        if(groupsLength > 0){
            var firstGroupID = gridGroups[0].id;
            gridView.toggleGroup(firstGroupID); 
        }
    }
});

 

startCollapsed:true;//所有group都合上