Memory leak in WebView with custom UserAgent

Hi,

When I use the method with using NavigateWithHttpRequestMessage to modify my UA, I cannot dispose my webview properly - there seems to be a memory leak when calling this.

In my code when I comment out the following line:

myWebView.NavigateWithHttpRequestMessage(httpRequest);

The memory leak goes away.

Please note this seems to be a WP8.1 issue only, the memory leak does not appear on Windows.

Is this a known issue? Is there a work around here?