Question: The problem?

```
<UI:PanelBrowser Margin="12,27,12,32"></UI:PanelBrowser>

```

WPF is ridiculous in that not manually specifying properties (Such as Width and Height) in this case causes them to have the values `Doulbe.NaN`. The problem is that I need to know this number. I'm not going to manually set a width and height in the XAML because that stops it from resizing. 

Given the above piece of XAML (this object is a simple subclass of the Border control), how can I get the values of the Width and Height properties at run-time?

Edit :

Wow, I feel ridiculous. I read about `ActualWidth` and `ActualHeight`, but they were consistently returning 0 and 0 for me. The reason is that I was testing for these properties in the constructor of the Framework Element, before they were actually initialized. Hope this helps someone who runs into the same issue and testing fallacies. :)

Answer: 
Try using the [FrameworkElement.ActualWidth](http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.actualwidth.aspx) and [ActualHeight](http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.actualheight.aspx) properties, instead.
You can use elements' `ActualWidth` and `ActualHeight` properties to get the values of the width and height when they were drawn.