public void OpenTweetDialog() {
TweetDialogViewModel vm = new TweetDialogViewModel();
string url = "https://twitter.com/intent/tweet?hashtags=" + VideoData.ApiData.Cmsid
+ "&text=" + HttpUtility.UrlEncode(VideoData.ApiData.Title) + "(" + NicoNicoUtil.ConvertTime(Time.Length) + ")&ref_src=twsrc%5Etfw&url=" + VideoUrl;
url = url.Replace(" ", "%20");
System.Diagnostics.Process.Start(url);
vm.OriginalUri = new Uri(url);
//App.ViewModelRoot.Messenger.Raise(new TransitionMessage(typeof(Views.Contents.Misc.TweetDialog), vm, TransitionMode.Modal));
}