[TIMOB-7526] iOS: Button - setting backgroundImage causes the button to glow when it is clicked

Description

Ti.UI.Button glows when it is being clicked if it has backgroundImage set.

Reproduction steps

Step 1: Make sure the image by default is located into your Resources folder Step 2: run the code below Step 3: click the button Step 4: notice that that button glows when it is being clicked

Expected behavior

Visual feedback instead of glow should actually be a "grey overlay on top of the non-transparent areas" as per earlier TiSDKs

Tested on

TiSDK > 1.8.1 TiSDK > 1.9.0.v20120126104634

Repro steps

var win1 = Titanium.UI.createWindow({  
    backgroundColor:'black'
});

var button = Ti.UI.createButton({
  width: 100,
  height: 50,
  backgroundImage: 'KS_nav_ui.png',
  //backgroundSelectedImage:'KS_nav_views.png',
  //backgroundFocusedImage:''
});

button.addEventListener('click', function(){ 
	Ti.API.info("clicked"); 
});

win1.add(button);

win1.open();