@Override
protected void onRender(Element target, int index) {
El wrap = new El(DOM.createDiv());
wrap.addStyleName("x-form-field-wrap");
wrap.addStyleName("x-form-file-wrap");
input = new El(DOM.createInputText());
input.addStyleName(fieldStyle);
input.addStyleName("x-form-file-text");
input.setId(XDOM.getUniqueId());