// [if] Override to prevent the new open shell to automaticaly become

    // an active shell.

    _beforeAppear : function() {

      qx.ui.layout.CanvasLayout.prototype._beforeAppear.call( this );

      qx.ui.popup.PopupManager.getInstance().update();

      var activeWindow = this.getWindowManager().getActiveWindow();

      this.getWindowManager().add( this );

      this.getWindowManager().setActiveWindow( activeWindow );

    },