addEventListener 'click' not working sometimes ?

Hey,

I have the following code:

var startButton = Titanium.UI.createButton({
    width: 180,
    height: 50,
    bottom: 0,
    backgroundColor: '#32CD32'
});
 
startButton.addEventListener("click", function cameraButtonClick (cam) {
    Ti.Media.takePicture();
});
 
var myOverlay = Titanium.UI.createView();
myOverlay.add(startButton);