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extjsextjs3

How to add a checkbox column in a gridpanel in ExtJS3.4

want to add a checkbox column in a gridpanel this.

I tried this. 

var sm = Ext.create('Ext.selection.CheckboxModel');

and in grid I am configuring this. selModel: sm,

Can any one help me in this.

Solution 
  •     Please follow this code
    I am sure this code is working fine.

     var sm = new Ext.grid.CheckboxSelectionModel({
                width: 25,
                singleSelect: true,
                header: ''
            });


     xtype: 'grid',
     sm: sm,
     store: store,
     trackMouseOver: true,
     cm: new Ext.grid.ColumnModel({
     defaultSortable: true,
         columns: [
              sm,
          { dataIndex: 'record', header: 'Record' },


                      ]
})