play sequence from button

two buttons placed in 2D and a model with 7 sequences loaded into resources

1.next

2.play

button 1 to load the sequence and button 2 to play the sequence. it works but I have to click them multiple times. 

$scope.next = function(){


$scope.view.wdg['model-1'].sequence = "app/resources/Uploaded/l-Creo 3D - 2.pvi";

}

$scope.play = function() {

angular.element(document.getElementById('model-1')).scope().play();

}