Open a Extjs Window with text area on click of image / button to save the long information or description

If you have rendered an image or button in column of the grid panel and you want to open a pop up in the form of extjs window onclick of  it.
The window contains an input text area which will allow the user to fill the data.
This text needs to be saved for the field associated with that column.
The following is the code which demonstrates the above mentioned description.




{header: "header", width:110, dataIndex: 'dataField',
                            xtype:'actioncolumn',
                              items: [{
                                 icon:'<image path>',
                                 style: {
                                      marginLeft: '5px'
                                 },
                                 handler: function(grid, rowIndex, colIndex) {
                                    var rec = grid.getStore().getAt(rowIndex);
                                    var descText = rec.get('dataField');
                                    openPopup(descText,rowIndex,rec);
                                 }
                              }]
                         },



       /*
        ** Open Window with text area
        */
        function openPopup(description,rowInd,record){
            var win = new Ext.Window({
                modal       : true,
                height      : 250,
                width       : 260,
                plain       : true,
                border      : false,
                resizable   : false,
                maximizable : false,
                draggable   : true,
                closable    : true,
                closeAction : 'destroy',
                title       : 'Title', 
                autoScroll  : true,
                buttonAlign : 'center',
                items: [{
                    xtype: 'textarea',
                    id :  'textAreaId',
                    value: description,
                    name: 'testing',
                    height: 184,
                    width: 248
                }],
                buttons: [{
                    text     : 'Submit',
                    onClick : function () {
                        // SAVE ACTION
                        try{
                            record.set('<reqd field from store>',Ext.getCmp('textAreaId').getValue());
                            win.destroy();
                        }catch(e){
                            win.destroy();
                        }
                    }                   
                }]
            }).show();

        }