private void Grid_Tapped(object sender, TappedRoutedEventArgs e)
{
var context = (e.OriginalSource as FrameworkElement).DataContext;
if (context is UserModel)
{
e.Handled = true;
ActionModel.UserClick(this, new WeiboUserClickEventArgs((context as UserModel).ID));
}
else if (context is MessageModel)
{
e.Handled = true;
ActionModel.ItemClick(this, new WeiboItemClickEventArgs(context as MessageModel));
}
}