class Button extends flash.display.SimpleButton {

  public var onClick : Void -> Void;
  public var onMouseOut : Void -> Void;

  public function new ( graphic : String ) : Void {

    onClick = doOnClick;
    super ();

    upState = new Image ("gfx_" + graphic + "_up");
    downState = new Image ("gfx_" + graphic + "_down");
    overState = new Image ("gfx_" + graphic + "_over");

    hitTestState = overState;
  }

  public function setLabel (text : String) {
  }

  public function doOnClick () {
  }
}

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var foo:Button = new Button ('leftPaneItem');
addChild (foo);