public void destroy() { super.destroy(); if (this._btnTypeFileShkPem != null) { this._btnTypeFileShkPem.removeItemListener(this); this._btnTypeFileShkPem.destroy(); this._btnTypeFileShkPem = null; } if (this._btnTypeFileShkDer != null) { this._btnTypeFileShkDer.removeItemListener(this); this._btnTypeFileShkDer.destroy(); this._btnTypeFileShkDer = null; } }