Grouped grid not rendered in window second time

Hi,

I 'm migrating an application in Ext JS 4.1.1 to 5.0.1.

Following is a grouped grid that is included in one window.

Code:

{
                xtype : 'gridpanel',
                forceFit : true,
                itemId : 'tag_rightgrid',
                width : 200,
                height : 300,
                autoScroll : true,
                hideHeaders : true,
                store : Ext.getStore('XXX'),
                features : [{
                    ftype : 'grouping',
                    groupHeaderTpl : '{name}'
                }],
                selModel : {
                    // selType : 'checkboxmodel',
                    mode : 'MULTI'
                },
                viewConfig : {
                    plugins : {
                        ptype : 'gridviewdragdrop',
                        dragGroup : 'secondGridDDGroup',
                        dropGroup : 'firstGridDDGroup'
                    },
                    listeners : {
                        drop : function(node, data, overRecord, dropPosition, options) {
                            Ext.getStore('XXX').sort([{
                                property : 'displayField',
                                direction : 'ASC'
                            }, {
                                property : 'value',
                                direction : 'ASC'
                            }]);
                        }
                    }
                },
                columns : [{
                    dataIndex : 'value',
                    width : 195,
                    filterable : true
                },{..}

This renders perfectly for the first time. The second time I open the window, it throws an error saying:

Uncaught TypeError: Cannot read property 'ownerCt' of null

in onGroupChange method of Ext.grid.feature.Grouping , me.grid.ownerCt, the grid object is null.

Spent quite some time debugging it to find the issue.

following is the link of the fiddle in which I have tried out something similar

http://ift.tt/1zEePIX

It throws an error saying Uncaught TypeError: Cannot read property 'addCls' of null

Grouped grid not rendered in window second time