@UiHandler ("postToWallButton")
public void handlePostToWallClick(final ClickEvent event) {
FeedPostOptions postOptions = FeedPostOptions.createFeedPostOptions().setMessage(postToWallMessageTextBox.getText());
Log.info("Post options: " + postOptions.toJSONString());
FBGWT.Graph.User.postToWall(postOptions, new AsyncCallback<Post>() {
@Override
public void onFailure(final Throwable caught) {
handleError("Error posting to wall", caught);