Angular on button click outside ctrl, pass button id

I want to call a function from outside the controller and pass it the button id. This is my current code :

<button class="btn btn-primary manageCompany" id=<%=comp._id%> data-toggle="modal" data-target="#manageCompany_pp" ng-click="clickMe()">Manage</button>
// .. More code


                <div class="modal fade" ng-controller="ModalCtrl" id="manageCompany_pp" tabindex="-1" cid="" role="dialog" aria-labelledby="manageCompany_pp">
                    <div class="modal-dialog modal-lg" role="document">
                        <div class="modal-content">
                            <div class="modal-header">
                                <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                                    <span aria-hidden="true">&times;</span>
                                </button>
                                <h4 class="modal-title" id="manageCompany_content">Manage Company</h4>
                            </div>
                            <div class="modal-body">
                                <div class='manageCompanyAlert'></div>
                              {{testData}}
                                <script>  </script>
                            </div>
                            <div class="modal-footer">
                              <button type="button" class="btn btn-primary" data-dismiss="modal">Close</button>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

And this is the content of my controller

app.controller('ModalCtrl', ['$scope', '$http', function($scope, $http) {
    $scope.clickMe = function() {
        $http.post('/modalRoutes/cdata', {
            id: 0 // Button ID should go here 
        }).success(function(cdata) {
            $scope.testData = cdata;
        });
    };
}]);