title: Semi-transparent background only in controls
body: <p>I wonder if it's possible to make a new template (e.g. for a button), that have semi-transparent background? I can set the <code>Background</code> property and then choose my <code>Opacity</code>, but here lies the problem... When I set opacity of the background, each element added as a content of an element with set <code>Opacity</code> will be transparent, too. How to avoid it?</p>