gistfile1.js

function percentageToPixels(p,width) {
	
	if (width == null) {
		width = Titanium.Platform.displayCaps.platformWidth-2;
	}
	
	return new Number((width * (p/100))).toFixed(0);
}

//create data entry view
var entryView = Ti.UI.createView({
  backgroundColor:'#0060AA',
  width:percentageToPixels(100),
  height:100,
  top:5
});

var controlsView = Ti.UI.createView({
  width:'auto',
  height:50
});

var controlsViewSub = Ti.UI.createView({
	  width:'auto',
	  height:50
	});

var b1 = Titanium.UI.createButton({
	title:'Save',
	width:percentageToPixels(25,entryView.width),
	height:35,
	right:0,
	enabled:false
});
controlsView.add(b1);

var tf1 = Titanium.UI.createTextField({
	width:percentageToPixels(70,entryView.width),
	height:35,
	left:0,
	borderStyle:Titanium.UI.INPUT_BORDERSTYLE_ROUNDED,
	autocorrect:false,
	hintText:'Enter a note...'
});