private void Image_MouseLeftButtonDown_1(object sender, MouseButtonEventArgs e)
{
ProductDocViewViewModel productDocViewViewModel = this.DataContext as ProductDocViewViewModel;
productDocViewViewModel.HideExpander();
}
// 当用户导航到此页面时执行。
protected override void OnNavigatedTo(NavigationEventArgs e)
{
ProductDocViewViewModel productDocViewViewModel = this.DataContext as ProductDocViewViewModel;
productDocViewViewModel.LoadData();
}