var options = {}; 

options.columnDefs ={
                            name: 'gakunen_name',
                            header1:'hizuke',
                            header4:'kamoku_kigo',
                            header3:'kakutei_kbn_meisho',
                            displayName: '全選択',
                            width: 50,
                            pinnedLeft: true,
                            enableColumnMenu: false,
                            cellClass: 'pinnedTextAlignCenter',
                            //type: 'checkbox',
                            noUnselect: true,
                            cellTemplate:'<input ng-click="grid.appScope.myhello();" ng-model="gakunen_name"  type="checkbox"/>', //ng-model="true"
                            enableSelectAll : true
                       }

grid.myhello=function(){
            alert(12);
        }

内嵌 ng-click 失效，如何让ng-click有效，其实我的最终目的，想改变 'gakunen_name' 的值。求各位大神指点