var myGrid = Ext.create('Ext.Container', {
    items: [
      {
        xtype: 'rallygrid',
        columnCfgs: [
          'FormattedID',
          'Name',
          { // Column 'Successors'
            xtype: 'templatecolumn',
            tpl: Ext.create('Rally.ui.renderer.template.FormattedIDTemplate'),
            dataIndex: 'Successors',

            renderer: function(value, metaData, record) {
              //console.log('Display in renderer: ', record.successorStore);
              var mFieldOutputSuc = '';
              var i;
              var mDependency;

              for (i = 0; i < record.successorStore.getCount(); i++) {
                mDependency = record.successorStore.getAt(i);
                console.log('mDependency = ', mDependency);
                mFieldOutputSuc = mFieldOutputSuc + mDependency.get('FormattedID') + '<br>'; // Correct return value?
              }

              return mFieldOutputSuc;
            }, //renderer: function(value, metaData, record) {
          }, // Column 'Successors'