title: Set Background Color on UIButton when Disabled?
body: <p>Is it possible to set the background color of a <em>disabled</em> <code>UIButton</code>?  We'd like to use a more muted color when the button is disabled, but I do not see any methods within <code>UIButton</code> that would allow this.  Is there a workaround or another way we could accomplish this?</p>