How to expand all nested level properties in WPF PropertyGrid?

 
private void PropertyGrid_Loaded(object sender, RoutedEventArgs e)
{
    PropertyView item1 = VisualUtils.FindDescendant(this, typeof(PropertyView)) as PropertyView;
 
    if (item1 != null)
       item1.ItemContainerGenerator.StatusChanged += ItemContainerGenerator_StatusChanged;
}
 
void ItemContainerGenerator_StatusChanged(object sender, EventArgs e)
{
    foreach (PropertyCatagoryViewItem item in VisualUtils.EnumChildrenOfType(this, typeof(PropertyCatagoryViewItem)))
     {
      foreach (var items in item.Items)
          {
            foreach (PropertyViewItem propertyviewitem in VisualUtils.EnumChildrenOfType(this, typeof(PropertyViewItem)))
                {
                  ToggleButton button = (ToggleButton)propertyviewitem.Template.FindName("ToggleButton", propertyviewitem);
                   if (button.Visibility == System.Windows.Visibility.Visible && !button.IsMouseOver)
                      {
                        button.IsChecked = true;
                      }
                 }
          }
     }
}