void AddCommentTapped()
        {
            var composer = new Composer();

            composer.NewComment(this, (text) => {
                try
                {
                    composer.DoWorkTest("Commenting...".t(), async() => {
                        await ViewModel.AddComment(text);
                        composer.CloseComposer();
                    });
                }
                catch (Exception e)
                {
                    Utilities.ShowAlert("Unable to post comment!", e.Message);
                }
                finally
                {
                    composer.EnableSendButton = true;
                }
            });
        }