Can not set CheckboxModel

[courtera]

I am trying to create a checkcolumn where I can only select 1 checkbox at a time. I have tried multiple ways of setting the CheckboxModel but have not gotten any of them to work. I am running 4.1.1. Below is my current attempt using checkcolumn. Any help is greatly appreciated thanks!

Ext.define('SelectorPanel' , {
   alias: 'widget.selectorpanel'
   extend: 'Ext.grid.GridPanel'
   height: 100,
   autoScroll: true,

   initComponent:function() {
      var me = this;

     var options = [ thing1, false, 'Thing1' ];

      var optionsStore = Ext.create('Ext.data.ArrayStore', {
          fields:['id', 'selectionbox' , 'text'],
          data:options
       });  
  
    var sm1 = Ext.create('Ext.selection.CheckboxModel' , {
          mode: 'SINGLE'
     });

  Ext.applyIf(me, {
       store: optionsStore,
       columns: [
           { 
              xtype: 'checkcolumn',
              width: 25,
              selModel: sm1,
             dataIndex: 'selectionbox'
            },
           {
             dataIndex: 'text',
             text: 'Things'
           }
        ]

    this.callParent(arguments);
});

   }

});

[slemmon]

I didn't think you set a selectionmodel on a column. This work at all for you?

Ext.define('SelectorPanel' , {
    alias: 'widget.selectorpanel'
    , extend: 'Ext.grid.GridPanel'
    , height: 100
    , width: 100
    , store: Ext.create('Ext.data.ArrayStore', {
        fields:['id', 'selectionbox' , 'text'],
        data:[[ 1, false, 'Thing1' ], [ 2, false, 'Thing2' ]]
    })
    , columns: [{
        dataIndex: 'text'
        , text: 'Things'
        , flex: 1
    }]
    , selModel: {
        selType: 'checkboxmodel'
    }
});


Ext.widget('selectorpanel', {
    renderTo: Ext.getBody()
});

[courtera]

Thanks for the reply slemmon, I did notice that I was using a checkcolumn and could not apply the selectionmodel to that so I revised the code a bit and was able to get it to work.

Ext.define('SelectorPanel' , {
   alias: 'widget.selectorpanel'
   extend: 'Ext.grid.Panel'
   height: 100,
   autoScroll: true,

   initComponent:function() {
      var me = this;

     var options = [ thing1, false, 'Thing1' ];

      var optionsStore = Ext.create('Ext.data.ArrayStore', {
          fields:['id', 'selectionbox' , 'text'],
          data:options
       });  
  
    var sm1 = Ext.create('Ext.selection.CheckboxModel' , {
          mode: 'SINGLE',
          showHeaderCheckbox: false,
          listeners: { select: function(model, record, index) {alert(record.get('id'); }} 
     });

  Ext.applyIf(me, {
       store: optionsStore,
              selModel: sm1,
       columns: [
           {
             dataIndex: 'text',
             text: 'Things'
           }
        ]

    this.callParent(arguments);
});

   }

});