protected override async void OnNavigatedTo(NavigationEventArgs e)
{
int?issue_id = e.Parameter as int?;
if (issue_id != null && !App.Client.Issues.TryGetValue(issue_id.Value, out Issue))
{
Issue = await Issues.Get(issue_id.Value);
if (Issue.Id == issue_id.Value)
{
App.Client.Issues.Add(issue_id.Value, Issue);
}
}
}