} else {
final TextBox header = new TextBox();
header.setText(headerText);
header.setMaxLength(20); // TODO change to resizable text box
header.addStyleName(CSS_POPUP_CONTENT_HEADER);
header.addKeyUpHandler(new KeyUpHandler() {
@Override
public void onKeyUp(KeyUpEvent event) {
headerUpdatedHandler.headerLabelChanged(header.getText());
}
});