public async void Initialize() {
UserInstance = new NicoNicoUser(this, UserPageUrl);
UserEntry = await UserInstance.GetUserInfoAsync();
Name = UserEntry.UserName;
UserContentList.Clear();
UserContentList.Add(new UserNicoRepoViewModel(this));
UserContentList.Add(new UserMylistViewModel(this));
UserContentList.Add(new UserVideoViewModel(this));
}