Possible values for Comboboxpopupanimationkey?

Question

I recently had a bug with combobox in the WPF. Was a bug related to a "blurring" in the source when it had only one item in the combobox while it opened. I solved the problem by removing the animation from it with the solution below.

I would like to know what other possible values I can define besides None. Research in MSDN but I found nothing.

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

  <PopupAnimation x:Key="{x:Static SystemParameters.ComboBoxPopupAnimationKey}">
       None
  </PopupAnimation>

</ResourceDictionary>  

Answer 1

The element PopupAnimation uses the enumeration of the same name, described here. Possible values are None, Scroll, Fade and Slide.