function after(){
                 fly(dom).fxUnwrap(wrap, r.pos, o);
                 st.width = r.width;
                 st.height = r.height;
                 fly(dom).afterFx(o);
            }
Slides the element into view.  An anchor point can be optionally passed to set the point of
origin for the slide effect.  This function automatically handles wrapping the element with
a fixed-size container if needed.  See the Fx class overview for valid anchor point options.
Usage:
<pre><code>
// default: slide the element in from the top
el.slideIn();

// custom: slide the element in from the right with a 2-second duration
el.slideIn('r', { duration: 2 });

// common config options shown with default values
el.slideIn('t', {
    easing: 'easeOut',
    duration: .5
});
</code></pre>
@param {String} anchor (optional) One of the valid Fx anchor positions (defaults to top: 't')
@param {Object} options (optional) Object literal with any of the Fx config options
@return {Ext.Element} The Element