I have a problem with my view. this is my code:

var barV = Titanium.UI.createView({
   borderRadius:0,
   backgroundImage:'images/bar.png',
   width:Titanium.Platform.displayCaps.platformHeight,
   height:44,
   top:0
});
mainW.add(barV);

In this view i try to create a button:

var topB = Ti.UI.createButton({
    width:23, height:24,
    top:10, right:10,
    backgroundImage:'images/topB.png',
    color:'#FFFFFF'
});
barV.add(topB);

But i want the view to have the width of the screen, so thats its full in both portrait and landscape. But when i just set width to the platform.Height the button ain't placing correct. How can i set it to scale the background, so the button allways stays in the right side, 10 px away from the side?

Please tell me if it's not understandable.