KeypadInput doesn't work if it's rendered inside ng-repeat

[tuan-pham]

The directive works well as expected. However, when I try to render a list of keypad-input using ng-repeat, the model couldn't be updated. Keypad emits the event still but InputKeyboard couldn't listen to it. Do you know how to solve this issue.
Below is the code snippet used to render list of keypadInput:

<a ng-repeat="i in[0,1,2]" class="input" data-ng-model="input3" data-ng-keypad-input="numeric" tabindex="1">{{input3}}</a>

KEYPAD.handleKeyPressed triggers

 function handleKeyPressed(event, key) {
                $scope.$emit(Keypad.KEY_PRESSED, key, padId);
        }

... but KEYPADINPUT.handleKeyPressed() never get called.