I’m trying to apply an image to a xtype=’button’ however when i do it my button looks like this

How can i make this image fill this button ?
Code (sencha touch 2 js):
{
xtype: 'button',
width: 140,
height: 60,
margin: 10,
right: 20,
text: 'Enter',
html: '<img src="resources/images/Dbutton.png"/>'
}
If the image is a background image on the button, then use the CSS property
background-size.Note that this won’t work in IE8 or earlier. You’d need to use a polyfill javascript if you want IE8 support. Try this one: https://github.com/louisremi/jquery.backgroundSize.js
Hope that helps.