private void PostMessage(string filename)
{
var tweetComposerViewController = new TWTweetComposeViewController();
tweetComposerViewController.SetInitialText(LanguageStrings.TweetMessage);
var image = UIImage.FromFile(filename);
tweetComposerViewController.AddImage(image);
tweetComposerViewController.SetCompletionHandler((TWTweetComposeViewControllerResult result) => {
this.parentController.InvokeOnMainThread(() => {
this.parentController.DismissViewController(true, null);
});
});
this.parentController.PresentViewController(tweetComposerViewController, true, null);
}