Easy Listener help needed

programming flash
1 
var mcl:MovieClipLoader = new MovieClipLoader();
var mclListener:Object = new Object();

this.createEmptyMovieClip("Plus",1);

// load images
mcl.loadClip("button1.jpg",Plus);
    
// when the image finishes loading
mclListener.onLoadInit = function(pic:MovieClip){
    pic.onRelease = function(){
        trace ("hi");
    }
}

The jpg is loading, but it’s not acting as a button. Any idea why?