Webview and html editor

Hi,

I am in the process of upgrading a XAML app from Windows 8 to 8.1. I was using successfully the yahoo's wysiwyg html editor. It is not working in 8.1. Can someone recommend some other html editor control as an alternative. I need something with similar features as for example the HTMLEditorExtender in the Ajax Toolkit you can use in ASP.NET.

Thanks.

NFG.

NFG