webview not loaded as child

Hi,

I'm trying to add 

a Webview → Border → StackPanel → Chart

Or Webview  → Canvas → Chart

Or WebView → Border → Chart

But the WebView is not displayed and no WebViewLoadedEvent is received.

I want to display a small webpage on a sub-area of the chart. WebView is a BaseControl so I don't see any reason why this isn't working. 

Any suggestions please?

Cheers,

Clark