final TextBox addTextTb = new TextBox();
addTextTb.setWidth("300px");
addTextTb.setMaxLength(1);
if(invokingWidget.getAccessKey() > 0)
addTextTb.setText(Character.toString(invokingWidget.getAccessKey()));
VkDesignerUtil.showAddTextAttributeDialog("Please add access key below", addTextTb, new IDialogCallback() {
@Override
public void save(String text) {
String charString = text.trim();
if(charString.length() > 0)
invokingWidget.setAccessKey(charString.charAt(0));