private async void Pin(object sender, RoutedEventArgs e)
{
if (((sender as MenuFlyoutItem).Tag as Message).Pinned)
{
await RESTCalls.UnpinMessage(((sender as MenuFlyoutItem).Tag as Message).ChannelId, ((sender as MenuFlyoutItem).Tag as Message).Id);
}
else
{
await RESTCalls.PinMessage(((sender as MenuFlyoutItem).Tag as Message).ChannelId, ((sender as MenuFlyoutItem).Tag as Message).Id);
}
}
