Get actual height of content in Silverlight Popup control

I need to get the actual height of the displayed content inside an opened pop up control:

Problem:

I want to show开发者_C百科 a lot of data in a grid inside a pop up. If this content became higher than the browser height, this content is cropped at the end of the window.

I there any way to get the height of this content (i know that pop up isn't in the visual tree)?

---

Try calling UpdateLayout() once all controls have been added to your popup.

You will then be able to get the ActualHeight of the popup.

This has a bit of a performance overhead so trying calling it as little as possible.