Silverlight Popup: How do I call a method after popup is opened?

I'm working with a Silverlight Popup control (SL4). I would like to update data shown on that popup every time the user opens it (IsOpen=true) by passing a string and calling a Private method located in the Popup control behind code to fetch updated data.

I was hoping to place code to make this happen in the Opened event of the Popup, but such an event does not seem to exist (even though I found some document开发者_如何学Cation on it).

I'm doing this in VB.

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There is definitely an Opened Event Handler

Namespace:

using System.Windows.Controls.Primitives;

Code:

 Popup popup = new Popup();
 popup.Opened += (s, args) =>
 {
    // do work
 };