PopupPlacement class is used in Silverlight to workaround the missing features of Microsoft Popup control compared to the one from WPF. For example there is no built-in boundary detection, no Placement property, no PlacementTarget property, etc.
Its use is very simple. You attach it on a popup instance and bind all needed properties. For example if you use it in ControlTemplate you have to bind PopupPlacement.IsOpen to some Boolean property of the control (probably using TemplateBinding or Binding with RelativeSource=Self).
You can also set Placement and PlacementTarget and that's it.
Here is a simple usage:
<!-- Popup child here -->
Let us know if you need more information.
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