views, labels or buttons above transparent view

Hi,

I have a container view which have opacity 0.7 it contains labels, view and buttons which should not have opacity. but thez are affected too.

for example labels should be white..they are a little gray. backgroundColor of buttons are a little transparent...

PS : this view is moved from the top to the down.

here is my code :

exports.createView = function(idAlbum, parentWindow){
 
    var start, end, hided = true;
    var viewInfosAlbum = Ti.UI.createView({
        height: 411,
        top: -371,
        backgroundColor: 'black',
        opacity: 0.7,
        zIndex: 1
    });
 
    var container = Ti.UI.createView({
        layout: 'vertical',
        top: 0
    });
 
    var nameLabel = Ti.UI.createLabel({ 
        font: {fontSize: 15, fontWeight: 'bold'},
        textAlign: Ti.UI.TEXT_ALIGNMENT_CENTER,
        color: '#fff',
        height: 40
    });
 
    var contenuAlbumContainer = Ti.UI.createView({
        top: 10,
        left: 10,
        height: 20,
        layout: 'horizontal'
    });
 
    var albumContentBold = Ti.UI.createLabel({
        font: {fontSize: 12, fontWeight: 'bold'},
        text: 'Contenu de l\'album :', 
        color: 'white',
        left: 0,
        zIndex: 2
    });
 
    var albumContent = Ti.UI.createLabel({
        font: {fontSize: 11},
        color: 'white',
        left: 0
    });
 
    contenuAlbumContainer.add(albumContentBold);
    contenuAlbumContainer.add(albumContent);
 
    var sizeContainer = Ti.UI.createView({
        left: 10,
        height: 20,
        layout: 'horizontal'
    });
 
    var sizeTitle = Ti.UI.createLabel({
        font: {fontSize: 12, fontWeight: 'bold'},
        text: 'Poids :', 
        color: 'white',
        left: 0,
        zIndex: 2
    });
 
    var sizeLabel = Ti.UI.createLabel({
        font: {fontSize: 11},
        color: 'white',
        left: 0
    });
 
    sizeContainer.add(sizeTitle);
    sizeContainer.add(sizeLabel);
 
    var datesContainer = Ti.UI.createView({
        left: 10,
        height: 20,
        layout: 'horizontal'
    });
 
    var datesTitle = Ti.UI.createLabel({
        font: {fontSize: 12, fontWeight: 'bold'},
        text: 'Date(s) :', 
        color: 'white',
        left: 0
    });
 
    var datesLabel = Ti.UI.createLabel({
        font: {fontSize: 11},
        color: 'white',
        left: 0
    });
 
    datesContainer.add(datesTitle);
    datesContainer.add(datesLabel);
 
    var descriptionTitle = Ti.UI.createLabel({
        font: {fontSize: 12, fontWeight: 'bold'},
        text: 'Description :', 
        color: 'white',
        left: 10,
        height: 20
    });
 
    var descriptionScrollView = Ti.UI.createScrollView({
        left: 10,
        height: 201,
        backgroundColor: 'green',
        contentHeight: 'auto'
    });
 
 
    var descriptionLabel = Ti.UI.createLabel({
        font: {fontSize: 11},
        height: Ti.UI.SIZE,
        color: 'white',
        left: 0,
        top: 10
    });
 
    descriptionScrollView.add(descriptionLabel);
 
    var operationContainer = Ti.UI.createView({
        height: 40,
        opacity: 1,
        zIndex: 2
    });
 
    var deleteButton = Ti.UI.createButton({
        title:'Delete',
        font: {fontWeight: 'bold', fontSize: 11},
        style: Titanium.UI.iPhone.SystemButtonStyle.PLAIN,
        backgroundColor: 'red',
        width: 60,
        height: 35,
        opacity: 1,
        borderRadius: 3,
        color: 'white',
        left: 35
    });
 
    var downloadButton = Ti.UI.createButton({
        title:'Download',
        style: Titanium.UI.iPhone.SystemButtonStyle.PLAIN,
        backgroundColor: 'black',
        color: 'white',
        opacity: 1,
        right: 35,
        zIndex: 2
    });
 
    operationContainer.add(deleteButton);
    operationContainer.add(downloadButton);
 
    var navBarContainer = Ti.UI.createView({
        height: 40,
        backgroundImage: 'images/barImage.png',
        bottom: 0,
        opacity: 1,
        zIndex: 3
    });
 
    var backButton = Ti.UI.createButton({
        title:'Back',
        height: 20,
        left: 10
    });
 
    backButton.addEventListener('click', function(e){
        parentWindow.close();
    });
 
    var moveImage = Ti.UI.createImageView({
        backgroundImage: 'images/move.png',
        width: 20, height: 20,
        bottom: 10
    });
 
    var shareButton = Ti.UI.createButton({
        title:'Share',
        height: 20,
        right: 10
    });
 
    shareButton.addEventListener('click', function(e){
 
    });
 
    navBarContainer.add(backButton);
    navBarContainer.add(moveImage);
    navBarContainer.add(shareButton);
 
    container.add(nameLabel);
    container.add(contenuAlbumContainer);
    container.add(sizeContainer);
    container.add(datesContainer);
    container.add(descriptionTitle);
    container.add(descriptionScrollView);
    container.add(operationContainer);
    container.add(navBarContainer);
 
    viewInfosAlbum.add(container);
 
    return viewInfosAlbum;
};