// subject grade
  AMES.Enrolments.SubjectGradeDataStore = new Ext.data.JsonStore({
    url: '/subject_grade_management/get_subject_grade.json',
		baseParams: {'id': null },
		autoload: false,
		root: 'subject_grade',
	  fields: [
      { name: 'id', mapping: 'id', type: 'int' },
      { name: 'name', mapping: 'name' },
			{ name: 'aural_begin', mapping: 'aural_end'}
	  ]
  });

	AMES.Enrolments.SubjectGradeDataStore.addListener('load', function(store,records,opts) {
		alert('something was loaded');
	});