[TIMOB-2497] Adding Label on Button, Label is not displayed ( v1.5.0 githash: b7b9e785)

I am trying to use the nightly build version 1.5 (b7b9e785), because I need to i18n features, but there are several strange behaviors that didn't happen before on 1.4 and older versions of 1.5. Most of the bugs I found are related to opacity and zIndex.

Problem: Adding a Label in a Button, the Label does not appear in the screen, even when setting high zIndex values. here is the piece of code with problem.

Code:

var btn_Username = Ti.UI.createButton({
    backgroundImage:    'images/btn_username.png',
    backgroundSelectedImage: 'images/btn_username_selected.png',
    height:             49,
    width:              243,
    left:               207,
    top:                0,
    opacity:            1,
    zIndex:             1,
    style: Titanium.UI.iPhone.SystemButtonStyle.PLAIN
});
view.add(btn_Username);

var titleLabel = Ti.UI.createLabel({
    color:      '#ffffff',
    text:       Ti.App.myMemeInfo.title,
    font:       {fontSize:14, fontFamily:'Helvetica Neue', fontWeight:'bold'},
    textAlign:  'left',     
    top:        14,
    left:       12,
    height:     20,
    width:      200,
    opacity:    1,
    zIndex:     99  
});
btn_Username.add(titleLabel);

When I add the "title" attribute in the Button it works, but I can't control the width of this text separately from the width of the Button, so this attribute does not work for me.

Platform versions: iOS SDK Version: 4.2
Titanium Developer: 1.2.1

The source code of my App is available on GihHub:
http://github.com/acarlos1000/MemeiPad/">http://github.com/acarlos1000/MemeiPad/